A One-Hit KO (or abbv. OHKO) is a very strong hit that can KO the enemy at 0% damage. However, almost all of the so-called OHKOs are highly conditional; they all share the following restrictions:
- The opponent does not tech, DI, or crouch cancel.
- There is not a wall to block the knockback.
- Knockback may be insufficient on very large stages (e.g. Hyrule Temple, New Pork City, 75m.)
- Knockback may be insufficient if the attack had been used previously. (Stale-Move Negation.)
- The opponent is not giant and/or metal.
- The damage ratio on 1.0 and no handicaps.
- The opponent does not Shield or Perfect Shield.
The rule of Final Smashes as One-Hit KO's is if they can kill opponent's at 0% from one side of Final Destination to the other and resulting in a KO.
Examples
- Roy's almost fully or fully charged Standard Special Move, Flare Blade.
- A forward Smash Attack done by a Home-Run Bat.
- Getting eaten by the Fish on Summit or a Bulborb on Distant Planet. These are not technically "hits"; rather, the victim is trapped and dragged off-screen.
- The Ultimate Chimera's bite. (In Stamina Mode, it's not always a One-hit KO.)
- Corneria's cannon laser shots. (Multiple Hits and it's possible to survive if rarely)
- A Pitfall against a Wario using the Wario Bike.
- The Dragoon.
- Beast Ganon
- Marth's Critical Hit Final Smash.
- Wario-Man's fully charged Wario Waft.
- Jigglypuff's Puff Up when Jigglypuff shrinks.
- Getting crushed in the Subspace Emissary.
- Tabuu's Off Waves (on Normal or higher difficulties in SSE). (Intense in Boss Battle mode)
- Tabuu's Golden Bracket move (Intense difficulty)
- Getting hit by a walking Bob-omb while using Fox's reflector. (only in SSB)
- Breaking Jigglypuff's shield. (counts as SD)
- Getting hit by the bow/front of the Pirate Ship.
- Getting hit by the first spike on Rumble Falls.
- Getting hit a Banaza Bill in Princess Peach's Castle.
Variables
- Mr. Game & Watch's fully charged Oil Panic absorbing Ness's PK Flash, or another strong projectile.
- Light Arrow, or Blue Falcon (depending on the field size, obstacles, or number of targets hit (more targets equals less knockback).
- Suicune's Aurora Beam.
- Deoxys' Hyper Beam.
- Getting caught in a Sacrificial KO. Not technically a hit, the opponent is trapped and dragged off-screen with the user.
- Mr. Game & Watch hitting a 9 with his Judge attack.