Editing One-hit KO

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{{disambig2|attacks with enough knockback to KO in one hit|KOs that occur instantly and bypass all knockback|Instant KO}}
:''For the smasher sometimes known as "OHKO", see {{Sm|Okoru}}.''
[[File:Roy Neutral B SSBU.gif|thumb|Roy’s [[Flare Blade]] is an example of a ''one-hit KO'' move.]]
A '''one-hit KO''', commonly abbreviated as '''OHKO''' (also referred to as an ''Instant KO'' in ''Melee''), is an attack in the ''{{b|Super Smash Bros.|series}}'' games with such high base [[knockback]] that it will [[KO]] an opponent at 0%. Such attacks currently exist in every installment of the series.

==Definition==
In general, a move is considered a one-hit KO if:
*It is capable of KOing [[Mario]] at 0% through sheer knockback alone from the middle of the respective game's [[Final Destination]] ({{SSB|Dream Land}} in ''[[SSB]]'').
*It is not a [[meteor smash]] unless the hitboxes are also capable of OHKOing onstage (meteor smashes like [[Beast Ganon]]'s are therefore OHKOs in ''[[Brawl]]'', while [[Luigi]]'s [[down taunt]] is not).
*It deals damage and/or does not cause a KO by forcibly re-positioning the opponent (such as [[push]] effects and dragging [[Final Smash]]es). There are some exceptions, such as {{SSBB|Samus}}' [[Zero Laser]] in ''Brawl'', which has dragging hits before the final hit.
*It is not extremely situational (such as the first hit of {{SSBM|Roy}}'s [[Blazer]] against {{SSBM|Jigglypuff}} on specific [[stage]]s in ''[[Melee]]'', or Jigglypuff's uncommonly high [[shield jump]]).

Another common standard is to compare the move's knockback to the [[smash attack]] of the [[Home-Run Bat]], one of the few moves intended to be the quintessential OHKO by the developers.

Moves with the potential to OHKO are not necessarily guaranteed to do so, and may fail to OHKO under the following circumstances:
*The opponent [[tech]]s, [[DI]]s, utilizes [[momentum cancel]]ling, and/or [[crouch cancel]]s to reduce the knockback or alter the trajectory of the attack.
*The opponent is flung into a [[wall]], which absorbs enough knockback to prevent the OHKO, or successfully executes a wall tech.
*The move's [[sweetspot]] (if any) does not land (such as [[Roy]]'s [[Flare Blade]] in every game featuring him).
*The move requires more hitboxes to land but some of them fail (for example, [[Lugia]]'s Aeroblast in ''Melee'', which can whiff if the character is hit on the edge and escapes; in ''Brawl'', it deals a single, immensely powerful hit which always OHKOs, but suffers from a smaller hitbox).
*The stage is extremely large (e.g. [[Temple]], [[New Pork City]], and [[75m]]), or the opponent is at the far edge of a stage.
*The move was weakened previously due to [[stale-move negation]].
*Opponents are under an effect that makes them more resilient (such as being [[Super Mushroom|giant]], [[metal]], or in an event that reduces the knockback they sustain), or the player is weakened (such as being [[Poison Mushroom|tiny]] or given a lower [[handicap]]).
*The [[launch rate]] is lower than standard, reducing knockback.
*The opponent's [[gravity]] is affected via [[equipment]].
*The player is under the effect of a [[sticker]] or a [[spirit]] that increases resistance to [[flinch]]. It is only possible in [[Adventure Mode]]s.

A [[Final Smash]] executed using [[Final Smash Meter]] always loses its OHKO potential, unless specific spirits prevent this.

==List of One-Hit KOs==
This page lists the moves that can OHKO within the rules mentioned above.

Certain moves and situations are '''not''' considered to meet the definition of one-"''hit''" KO's:

*Moves or hazards that inflict no [[knockback]], for example, being flown off the screen by the [[Landmaster]] or eaten by the [[Summit]]'s [[Fish]] or [[Distant Planet]]'s [[Bulborb]]), as they simply drag opponents into the [[blast line]]s.
*[[Sacrificial KO]]s, [[self-destruct]]s and [[instant KO]]s (such as [[Bowser]]'s [[Flying Slam]] or [[Hero]]'s [[Whack]]), as they do not deal any conventional knockback.
*Moves that hit an opponent who is close to a blast line (such as [[Pikachu]]'s very powerful [[Thunder]] in ''[[Brawl]]'' or [[Ike]]'s [[Great Aether]] on specific [[stage]]s in the same game), as almost any typical attack ingame will be able to KO opponents at that point.

Some [[stage hazard]]s or [[enemies]] are capable of OHKOing on their respective stages, and will be listed below.

===In ''[[Super Smash Bros.]]''===
Moves that KO at 0% are almost nonexistent in the original ''Super Smash Bros''. In fact, aside from the Home-Run Bat, only one move in the game is able to OHKO, and only under uncommon conditions.
====Items====
*A [[smash attack]] with the [[Home-Run Bat]].
*If {{SSB|Fox}} uses {{b|Reflector|Fox}} on a walking [[Bob-omb]], he (as well as any character caught in the blast radius) will be OHKO'd.
*If two Foxes use Reflector on a [[Green Shell]], it will eventually gain OHKO power after 3-4 reflects.

====Video====
The following video demonstrates the main moves that KO at 0% in ''Smash Bros.'' for the Nintendo 64:

{{#widget:YouTube|id=OslLkfYGSwU}}

===In ''[[Super Smash Bros. Melee]]''===
Unlike in ''Smash 64'', there are multiple moves that can OHKO in ''Melee'', including [[Character|playable character]]s' attacks and [[stage hazard]]s. They still remain relatively rare, however.

====Playable characters' moves====
*{{SSBM|Roy}}'s [[Flare Blade]] fully charged.
*Roy's [[Counter]] (sword hitbox) upon countering a hitbox that deals at least ~35% damage (sweetspot).
*{{SSBM|Mr. Game & Watch}}'s fully loaded [[Oil Panic]] after [[absorb]]ing three strong projectiles (such as three [[PK Flash]]es).

Contrary to common belief, Roy's [[Blazer]] is not an OHKO, having very high [[fixed knockback]] but not quite enough to qualify under the required conditions. However, in particular situations, it could potentially KO very light characters at 0% in small [[stage]]s if only the first hit connects, specifically {{SSBM|Pichu}} and {{SSBM|Jigglypuff}}.
Likewise, Mr. Game & Watch's [[Judge]] #9 is not an OHKO, having very high knockback but not quite enough to qualify under the required conditions.

====Items/Enemies====
*A [[smash attack]] with the [[Home-Run Bat]].
*Touching [[Moltres]].
*[[Articuno]]'s Icy Wind.
*Getting caught in [[Lugia]]'s Aeroblast (if most hits connect). Touching Lugia's body can also lead to an OHKO if multiple hits chain (while a single hit KOs {{SSBM|Mario}} as low as 35%).
*A thrown [[Polar Bear]] (smash throw).
*A [[Green Shell]] gains OHKO power when reflected 3 or 4 times by two {{SSBM|Fox}}es using [[Reflector]].

====Stage hazards====
*Rapid laser shots from the Great Fox on [[Corneria]], as well as the turrets while the Great Fox is charging.
*On [[Flat Zone]], if a falling tool is launched at enough speed (after either being hit by an extremely powerful attack such as a [[Home-Run Bat]] swing, or being launched after receiving enough damage), it will OHKO anyone it slams into.
*[[Banzai Bill]]'s explosion on [[Princess Peach's Castle]] (if all hits connect).

While touching a blue [[Klaptrap]] on [[Jungle Japes]] causes a powerful [[meteor smash]] of OHKO power, it is otherwise unable to cause a conventional OHKO by the standards mentioned above.

====Bosses====
The following will usually cause an OHKO on Very Hard [[difficulty]] only:
*{{SSBM|Master Hand}}'s Reverse Throw
*Master Hand's Flying Slap
*Master Hand's Finger Drill when preparing to launch
*{{SSBM|Crazy Hand}}'s Fake-Out Slap and Flying Slap.
*Master Hand and Crazy Hand's Crush (if all hitboxes land), Power Punch, Flying Punch (sweetspot), and Jetstream (sweetspot).
*Combined Master Hand's and Crazy Hand's Applause (if all hits connect) and Sandwich Punch.

====Others====
In [[Cruel Melee]], almost all the attacks of the [[Fighting Wire Frames]] are powered so much that they can easily OHKO every character. These moves include, for example, [[forward smash]] and [[up smash]], but also punches, kicks, and other moves.

====Video====
The following video demonstrates nearly all the moves and hazards that KO at 0% in ''Melee'':

{{#widget:YouTube|id=mb5qAONMjLs}}

===In ''[[Super Smash Bros. Brawl]]''===
''Brawl'' continued the trend of adding several OHKOs into the game, resulting in a huge number of them (especially in [[The Subspace Emissary]]). However, the majority are [[boss]] attacks, with relatively few being standard moves of playable [[character]]s. On the higher [[Difficulty|difficulties]] of The Subspace Emissary, several boss attacks become invariable OHKOs.

Some notes:
*In The Subspace Emissary, the player's [[gravity]] and [[falling speed]] are automatically increased up to 19% from normal Brawls, making KOs less likely.
**It is also possible to use very strong [[flinch]] or [[launch]] resistance [[sticker]]s to severely reduce knockback, although they are unlikely to protect from very powerful moves of OHKO power. This becomes more evident on the higher difficulties.
*In Boss Battles, boss attacks are normally weaker, having slightly more than one half of their original speed and power (with some notable exceptions). This is done to partially compensate the fact that the player has only one [[stock]] and no continues, items or stickers. As such, almost none of the boss attacks which OHKO in Emissary will do so in Boss Battles, except for Tabuu' Off-Waves on intense.

====Playable characters' standard moves====
*{{SSBB|Ike}}'s stage 8 [[Eruption]]. Must be fresh in versus mode.
*{{SSBB|Mr. Game & Watch}}'s fully loaded [[Oil Panic]] after [[absorb]]ing three medium power [[projectile]]s (such as three [[PK Flash]]es) or a very strong one.
*The following [[counterattack]]s:
**Ike's Counter (sword and body hitboxes) upon countering a hitbox that deals at least ~45% damage.
**{{SSBB|Marth}}'s Counter (sword and body hitboxes) upon countering a hitbox that deals at least ~50% damage.
*Any sufficiently strong or repeatedly [[Reflector|reflected]] projectile when reflected or countered, such as {{SSBB|Zelda}}'s [[Din's Fire]], or a [[Green Shell]].

====Final Smashes====
*Marth's [[Critical Hit]].
*{{SSBB|Lucario}}'s [[Aura Storm]] at high [[Aura]] if most hits connect.
**If the initial take off lands, the attack OHKOs {{SSBB|Mario}} when Lucario has only taken 95% damage (roughly a 55% Aura). Considering only the beam's power, it is an OHKO starting from 125% damage for Lucario (roughly a 73% Aura).
*{{SSBB|Pokémon Trainer}}'s [[Triple Finish]] if most hits connect (always needs the last hit to land for a KO).
*{{SSBB|Ganondorf}}'s [[Beast Ganon]] if most hitboxes land (at least one stomp and charge). If a character paralyzed by Beast Ganon is not hit by the charge afterward, they will be inflicted a [[meteor smash]] of OHKO power.
*Zelda's [[Light Arrow]] (first opponent only).
*{{SSBB|Samus}}' [[Zero Laser]] if all hits connect.
*{{SSBB|Olimar}}'s [[End of Day]] if all hitboxes land (bury, ascent, and explosion). Offstage opponents hit by the rocket's thrusters will also experience an OHKO via meteor smash.
*{{SSBB|Captain Falcon}}'s [[Blue Falcon]].
*[[Wario-Man]]'s [[Wario Waft]] fully charged.

While close, {{SSBB|Luigi}}'s [[Super Jump Punch]] during [[Negative Zone]] is not considered a true one-hit KO under the general definition. Since characters will have taken damage during the Final Smash, it doesn't qualify as a one-hit KO. Even if the damage taken is removed, it doesn't start KOing Mario until 5%; {{SSBB|Bowser}} is KOd around 7%, making it a very powerful tactic. In fact, while Negative Zone is active, characters' [[weight]] could be severely reduced, making KOs much more likely.

====Items====
*The [[Dragoon]].
*A [[smash attack]] with the [[Home-Run Bat]].
*Touching [[Moltres]].
*[[Suicune]]'s Aurora Beam.
*[[Deoxys]]'s Hyper Beam.
*[[Electrode]]'s Explosion when smash thrown. If an Electrode fails to burst, it can still be picked up and smash thrown with guaranteed OHKO power.
*If {{SSBB|Wario}} runs over a buried [[Pitfall]] while riding on his [[Wario Bike]], he will be sent flying at OHKO power. A thrown Pitfall can also meteor smash midair opponents with OHKO power.
*When a [[Hothead]] reaches its full power for the last seconds before fading, or after taking enough [[damage]], any contact will be an OHKO (touching the sparks is even more powerful).
**If an uncharged Hothead is hit by an [[electric]] or [[flame]]-based hitbox that deals at least 30% damage (such as {{SSBB|Ike}}'s stage 6-9 [[Eruption]]), it will OHKO when smash thrown or launched. Any contact while traversing the stage at this strength (or with the sparks it emits) will also OHKO.
*If a [[Soccer Ball]] is launched at enough speed (after either being hit by an extremely powerful attack such as [[forward smash]] or a Home Run bat swing, or simply being launched after receiving enough damage), it will OHKO anyone it slams into.

====Stage hazards====
*The [[Ultimate Chimera]]'s bite on [[New Pork City]].
**If the the bite lands on the mouth's edge, it deals the same immense knockback of Marth's Critical Hit. If the bite traps the character inside the mouth (or the Ultimate Chimera turns around to inflict a reverse bite), both knockback and damage are even higher, rivalling [[Tabuu]]'s Off Waves on the higher difficulties.
*[[Corneria]]'s laser beams.
*Touching the hull of the [[Pirate Ship]].
*The first and fourth spikes on [[Rumble Falls]] (can easily be teched).

While touching a [[Klaptrap]] on [[Jungle Japes]] causes a powerful [[meteor smash]] of OHKO power, it is otherwise unable to cause a conventional OHKO by the standards mentioned above.

====[[Classic Mode (SSBB)]] bosses====
Note: these moves will not OHKO in Boss Battles unless stated otherwise.
;[[Master Hand (SSBB)]]
*Reverse Throw - Intense difficulty 
;[[Crazy Hand (SSBB)]]
*Reverse Throw - Intense difficulty 

====[[The Subspace Emissary]] and [[Boss Battles]] bosses====
Note: these moves will not OHKO in Boss Battles unless stated otherwise.
;[[Rayquaza]]
*Iron Tail - Intense difficulty, low HP, tip. Can be teched.
;[[Galleom]]
*Collapse - sweetspot can OHKO on Very hard and Intense. Sourspot can OHKO on Intense.
*Double Lariat - all hits connect, Intense.
*Giant Jump - landing directly on opponent on Intense at low HP.
*Uppercut - sweetspot, Intense at low HP.
*Rush & Slam - Intense at low HP against grounded opponents. Heavyweights may survive at 0%.
;[[Meta Ridley]]
*Mega Fire Ball - Intense difficulty, low HP.
*Falcon Flyer Pull - giant fireball at point-blank on Intense.
;[[Tabuu]]
*Off Waves - Normal difficulty or higher; OHKOs middleweight on Easy when Tabuu has less than half [[HP]] remaining. Will also OHKO in Boss Battles, but only on Intense.
*Movement Throw - Hard difficulty or higher.
*Tabuu Shot (large energy ball) - Very Hard difficulty or higher.
*Blade Charge - Intense difficulty. OHKOs middleweights on Very Hard when Tabuu has less than half HP left.
*Shadow Laser - Intense difficulty.
*Discharge Attack (body) - Intense difficulty.
*Tabuu Fire - Intense difficulty.

Being the final boss, Tabuu has the greatest number of OHKO moves, is the only boss with a guaranteed OHKO move below Very Hard difficulty, and is the only boss with a guaranteed OHKO move in Boss Battles.

====Others====
*In [[Cruel Brawl]], almost all the attacks of the [[Fighting Alloy Team]] are powered so much that they can easily OHKO every character. These moves include, for example, [[forward smash]] and [[up smash]], but also punches, kicks and a very high number of moves. Each of the Alloys has also more powerful specific attacks, such as kicks for the Blue Alloy or punches for the Red Alloy, which are both a guaranteed OHKO from the center of the stage even for {{SSBB|Bowser}}. A similar type of strengthening (or slightly lower) was seen in ''Melee''. Also, the [[Shadow Bug|Shadow Clones]], [[False character|Subspace Copies]] and [[Boss|opponents]] battled in The Subspace Emissary are powered up this way on the higher difficulties only.

====Video====
The following video demonstrates some moves and hazards that KO at 0% in ''Brawl'':

{{#widget:YouTube|id=EpyjRINBJbk}}

This video shows some other OHKOs, including more [[boss]] attacks.

{{#widget:YouTube|id=mU6F6uHrQJs}}

===In ''[[Super Smash Bros. 4]]''===
Like ''Brawl'', ''SSB4'' continues to add OHKOs to the game, though mostly playable [[character]]s' moves. Also, {{SSB4|Bayonetta}}'s [[Infernal Climax]] becomes the first playable character's move capable of an [[Instant KO]].

====Playable characters' standard moves====
*{{SSB4|Roy}}'s fully charged and almost fully charged [[Flare Blade]] (sweetspot).
*{{SSB4|Mr. Game & Watch}}'s fully loaded [[Oil Panic]] after [[absorb]]ing three medium power projectiles or a very strong one.
*{{SSB4|Villager}}'s [[Pocket]] after it has absorbed a particularly strong projectile, most notably [[Timber]]. Powerful projectiles released by Pocket that can still be reflected will also OHKO, such as {{SSB4|Zelda}}'s fully charged [[Phantom Slash]].
**Many other [[reflector]]s also share this behaviour, especially {{SSB4|Ness}}'s bat.
*The following [[counterattack]]s:
**Ike's [[Smash Counter]] and {{SSB4|Shulk}}'s [[Power Vision]] custom moves upon countering a hitbox that deals 30% damage or more.
**{{SSB4|Corrin}}'s [[Counter Surge]], Ike and Roy's [[Counter]], and Shulk's [[Vision]] upon countering a hitbox that deals 35% damage or more. These counters technically have varying degrees of knockback, but they nevertheless achieve a KO at 0% without DI.
**{{SSB4|Mii Swordfighter}}'s [[Blade Counter]] upon countering a hitbox that deals 37% damage or more.
**{{SSB4|Lucina}} and {{SSB4|Marth}}'s Counter, {{SSB4|Little Mac}}'s [[Slip Counter]], and {{SSB4|Palutena}}'s {{B|Counter|Palutena}} upon dealing the 50% damage cap with their counters (this requires countering a hitbox that deals at least ~38.5% damage for Little Mac and Palutena, and at least 40% damage with Lucina and Marth).

Contrary to its name and intention, Little Mac's [[KO Uppercut]] does not KO until above about 30% damage. At 0%, it falls short of the necessary amount of knockback, KOing a character as light as {{SSB4|Jigglypuff}} at 12%. Also, {{SSB4|Ganondorf}}'s reverse aerial [[Warlock Punch]] is the most powerful non-OHKO attack, KOing {{SSB4|Mario}} from the center of [[Final Destination]] as low as 1% on its [[sweetspot]], though it can easily KO all lighter characters at 0% when sweetspotted. With [[rage]], it eventually gains OHKO power.

====Playable characters' moves (with rage applied)====
While the following moves do not guarantee OHKO power under normal circumstances, with [[rage]], they can perform an OHKO:
*{{SSB4|Lucario}}'s fully charged [[forward smash|forward]] and [[up smash]], [[aura]] and rage stack.
*Ganondorf's reverse and / or aerial Warlock Punch.
*{{SSB4|Kirby}}'s [[Giant Hammer]].

====Final Smashes====
*Marth and Lucina's [[Critical Hit]].
*Some of [[Giga Mac]]'s attacks when fully charged and [[sweetspot]]ted:
**[[Straight Lunge]], [[up smash]] and [[forward smash]] (when angled up or horizontally).
*Shulk's [[Chain Attack]] when boosted with the [[Monado Arts#Customization|Hyper Smash Monado Art]] (extremely frame-precise, as the final hit must land before the Art expires).
*{{SSB4|Captain Falcon}}'s [[Blue Falcon]] (barely in OHKO threshold, easily [[DI]]ed by holding towards the stage).
*[[Wario-Man]]'s fully charged [[Wario Waft]].

====Items====
*The [[Dragoon]].
*A smash attack with the [[Home-Run Bat]].
*[[Electrode]]'s Explosion after being smash thrown.
*If a [[Hothead]] is powered up significantly by a [[flame]]-based hitbox (30% total or higher), it will gain OHKO power when smash thrown or emitting sparks.
**[[Equipment]] can increase the player's damage, increasing the amount of damage a Hothead can be charged by and thus making it easier to reach OHKO power.
*The [[Black Knight]] item from [[Smash Tour]] will cause smash attacks to have a 30% chance to have 5 times knockback, occasionally turning them into OHKOs.

====Stage hazards====
*Touching the hull of the boat on [[Wuhu Island]].
*Touching the hull of the [[Pirate Ship]].

While touching a [[Klaptrap]] on [[Jungle Japes]] causes a powerful [[meteor smash]] of OHKO power, it is otherwise unable to cause a conventional OHKO by the standards mentioned above.

====Other====
While it isn't accessible in regular battles, the [[Target Blast bomb|bomb]] used in the [[Target Blast]] stage apparently has more than enough power to OHKO under normal conditions.

====Bosses====
The following will usually cause an OHKO on 8.0 or higher [[Difficulty|difficulties]]:
*These [[Master Core]]'s attacks:
**Blast Waves (only used if the player does not defeat it in time: about 45 seconds). Ironically, the chances to survive are higher if the player is closer to the [[blast line]]s.
**The final explosion after unleashing the last Blast Wave (very small hitbox). However, it can never truly defeat the players as they have already won by the time the hitboxes land.

{{#widget:YouTube|id=vfWVGiCxTaI}}

====Video====
The following video demonstrates all the moves and attacks that KO at 0% in ''Smash 4'':
{{#widget:YouTube|id=Dj5wW5-uFwI}}

===In ''[[Super Smash Bros. Ultimate]]''===
Like ''SSB4'', ''Ultimate'' continues to add OHKOs to the game, though still focusing on playable [[character]]s' moves (while [[Final Smash]]es and [[item]]s have been slightly [[nerfed]] again from the previous game). Several characters also gain the ability to [[instant KO]] through Final Smashes or special moves; these do not count as OHKOs and belong in its respective page.

====Playable characters' moves====
*{{SSBU|Roy}} and {{SSBU|Chrom}}'s fully charged and almost fully charged [[Flare Blade]] (sweetspot).
*{{SSBU|Hero}}'s fully charged [[forward smash]] with [[Command Selection|Oomph or Psyche Up]] active (if the sweetspot lands as a critical hit).
*{{SSBU|Kirby}}'s reversed aerial [[Warlock Punch]] (after [[inhaling]] {{SSBU|Ganondorf}}).
*The following [[counterattack]]s:
**Roy and Chrom's [[Counter]], {{SSBU|Joker}}'s [[Rebel's Guard|Tetrakarn]] with [[Arsène]], {{SSBU|Shulk}}'s [[Vision]] with [[Monado Arts|Smash Art]], and {{SSBU|Mii Brawler}}'s [[Counter Throw]] countering a hitbox that deals around 35% damage or more.
**{{SSBU|Corrin}}'s [[Counter Surge]] and {{SSBU|Ike}}'s [[Counter]] countering a hitbox dealing around 40% damage or more.
**{{SSBU|Marth}} and {{SSBU|Lucina}}'s [[Counter]] countering a hitbox dealing around 43% damage or more.
**Any sufficiently strong or repeatedly [[Reflector|reflected]] projectile when reflected.
*Any throwable item under extreme conditions which cause them to move at a very high speed. An example is {{SSBU|R.O.B.}}'s fully charged [[Gyro]].

====Playable characters' moves (with rage applied)====
*Hero's [[Command Selection|Hatchet Man]] with Psyche Up active.
*Hero's [[Zap|Kazap]] with Psyche Up, Oomph, and Hocus Pocus Giant active.
*{{SSBU|Mr. Game & Watch}}'s [[Oil Panic]] after [[absorb]]ing a very strong projectile (like Hero's [[Frizz|Kafrizz]]).
*Mr. Game & Watch's [[Judge]] #9.
*Ganondorf's reversed aerial [[Warlock Punch]].
*{{SSBU|Lucario}}'s fully charged [[forward smash]], [[aura]] and [[rage]] stack (after patch 9.0).

====Final Smashes====
*Marth and Lucina's [[Critical Hit]].
*Lucario's [[Aura Storm]] at max [[Aura]] if all hits connect.
*{{SSBU|Olimar}}'s [[End of Day]] if it hits a fighter that cannot be [[buried]]. End of Day's bury hitbox deals 633.15 units of knockback, more than enough to KO any character on ''Ultimate''{{'}}s [[Training (stage)|Training Mode Stage]].

Final Smashes executed using [[Final Smash Meter]] always lose their OHKO power, with Critical Hit KOing {{SSBU|Mario}} at 20%.

====Items====
*The [[Dragoon]].
*A smash attack with the [[Home-Run Bat]].
*[[Electrode]]'s Explosion when smash thrown.
*A [[Hothead]] when brought from no charge to significant overcharge by a single [[Flame|fire]] attack that deals over 30% damage. Hothead's damage output depends on the average damage output of the moves used to bring it to full charge, and thus gains OHKO power when overcharged by an extremely powerful fire move. If the Hothead hits opponents while [[spark]]ing, it can OHKO without being overcharged as much, but not when starting from zero charge.
**For example, a fresh fully charged Flare Blade will sufficiently overcharge a Hothead, but doing so in Training with stale moves disabled removes its ability to sufficiently charge it, as the additional 1.05× freshness bonus just barely grants Flare Blade enough damage to do so.
**[[Spirit]]s can increase the player's damage, increasing the amount of damage a Hothead can be charged by and thus making it easier to reach OHKO power.
*The [[Deku Nut]]'s explosion on a grounded target that cannot be stunned, such as [[Sandbag]], or Kirby in his [[Stone]] transformation.

====Stage hazards====
*Touching the hull of the [[Pirate Ship]].
*Touching the hull of the boat on [[Wuhu Island]].

While being hit by a [[Klaptrap]] on [[Jungle Japes]] causes a powerful [[meteor smash]] of OHKO power, it is otherwise unable to cause a conventional OHKO by the standards mentioned above.

====Other====
While inaccessible in a regular fashion without hacking, the gun found on the [[Stage#In_Ultimate_3|Free the Spirit screen's stage]] is programmed in as its own usable item, inflicting 30% damage with OHKO power (mainly because the Free the Spirit stage is very small with close blast zones).<ref>[https://www.youtube.com/watch?v=W5d-BGAls_s The Results Screen is a FULLY PLAYABLE Stage? | Super Smash Bros. Ultimate]</ref> This situation is similar to ''Smash 4''{{'}}s Target Blast bomb.

====Video====
The following video demonstrates all the moves and hazards in ''Ultimate'' that inflict enough knockback to KO at 0%, alongside some powerful moves that don't. However, it also includes a few moves and hazards that do not inflict any knockback, such as [[Instant KO]]s:

{{#widget:YouTube|id=Y5IIRDd5ggY}}

===Conclusive video===
The following video demonstrates several one-hit KOs from every ''Smash'' game except ''Ultimate'':

{{#widget:YouTube|id=y6_g2_FvFdA}}

==Gallery==
<gallery>
Lucario Final Smash SSBU Max Aura.gif|Lucario's Aura Strom at max aura.
Marth Final Smash SSBU.gif|Marth's [[Critical Hit]].
Chrom Neutral B SSBU.gif|Chrom's [[Flare Blade]].
</gallery>
==Trivia==
*''[[Brawl]]'' features the most guaranteed OHKOs; however, the vast majority are from [[boss]]es.
*The [[Home-Run Bat]] is the only [[item]] (and by extension, the only attack) able to perform a guaranteed OHKO in every ''Smash'' game, at least on its {{b|sweetspot|hitbox}}.
*[[Roy]]'s [[Flare Blade]] and [[Counter]] are the only moves to maintain their OHKO power in every installment.
*At least one playable character from the {{uv|Fire Emblem}} universe possesses a move with OHKO potential in every game. Other main characters appear as items with OHKO power ([[Black Knight]] in ''[[Smash 4]]'').
*[[Marth]]'s [[Critical Hit]] is the only Final Smash to maintain its OHKO power in every installment. Throughout all games, it is also the most powerful attack of any character's standard moveset (in terms of knockback) without any exterior factors or buffs, being impossible to survive if in direct sight of a blast line, even on the largest stages of each game.
*While the majority of OHKOs will fail to work on characters under the effects of a [[Super Mushroom]] or [[Metal Box]], a few attacks have such high knockback that they will still OHKO under these circumstances. In ''Brawl'', this includes [[Suicune]]'s Aurora Beam, Marth's Critical Hit, the [[Ultimate Chimera]]'s bite, and several [[boss]] attacks.
**Starting from ''Smash 4'', a few Final Smashes have hitboxes that negate the effects of such buffs, such as Marth's Critical Hit.
*Tabuu on Intense difficulty in [[The Subspace Emissary]] has more OHKOs than any other boss or enemy in any ''Smash'' game, with 7.
*The most powerful moves in the ''Smash'' series are Tabuu's Off Waves (waves and contact with his body) on Intense difficulty in The Subspace Emissary and Boss Battles, and the Ultimate Chimera's bite in ''Brawl''. Both these attacks are the most damaging moves, dealing 100%-200% damage and having immense knockback.
*Master Core's final explosion on 8.0 difficulty or above is the only OHKO that will never KO the player, since the battle is already won before the hitboxes land.
**Galleom's Tank Rush and Tank Rush & Slam can hit the player after the boss is defeated (with OHKO power on the higher difficulties), but since the battle is already won, the player can never be KOed.

==References==
{{reflist}}

[[Category:Attacks]]
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