Armor

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Knockback resistance, known by some as super armor, is a phenomenon that manifests itself during certain moves in all three Super Smash Bros. games. It is defined as a character not flying as far when hit during a certain time, or in some cases not even flinching. Note that knockback resistance, as the name implies, only affects knockback. The attack's full damage will still be taken.

As an example of how knockback resisting works, take Yoshi's double jump. During his upward movement, Yoshi gains (approximately) 120% knockback resistance. This does not mean he flies 120% less distance when hit. It means that when hit, his flight distance is calculated from his current percentage minus 120%. So if Yoshi is hit with 150% damage during his double jump, he wil fly as far as he would if he had 30% damage. If the knockback resistance calculation's result is negative (say -50%) then Yoshi would not even flinch. This would not prevent Yoshi from being affected by hitstun.

In Super Smash Bros.

Knockback resistance was limited to Yoshi's double jump, Ness's throwing action, Giant DK, and Metal Mario. Some could also say that Master Hand has infinite knockback resistance.

In SSBM

Yoshi retained his resistance, while Metal and Giant characters had their resistance decreased a whole lot. Also, Giga Bowser has about 50% knockback resistance when fought in Adventure Mode.

In SSBB

Many characters inherit knockback resistance, often in the form of moves that give a temporarily infinite amount:

Character	Moves	Conditions and notes
Ike Bowser Snake Marth Donkey Kong Ganondorf Pokémon Trainer (Squirtle, Charizard, Ivysaur)	Aether and Eruption Forward Smash , Bowser Bomb and Giga Bowser (Final Smash) Cypher Dolphin Slash Giant Punch and Carry Throw Flame Choke Fly ,Withdraw ,and Squirtle's forward Smash.	Aether-When the sword is out of his hands. Eruption-Between when the special move button is released and when the sword hits the ground. Giga Bowser has it for the entire period of being Giga Bowser.Bowser Bomb-Only during ascension time Entire move, although can be broken by strong moves such as Bowser's forward smash. First 4 frames only Giant Punch-Only if fully charged When he is holding the opponent above him. Opponent also gets super armor. Ivysaur has no super armor moves

• Super Dedede Jump (during ascension time)
• Mirror Shield (right before Pit pulls it out)
• Pikmin Order (during the beginning)
• PK Thunder, PK Fire, PK Freeze (during very beginning frames) for Lucas
• Wario's forward smash
• Wario Waft
• Yoshi double-jump (during ascension time when he is moving with it)
• At the beginning when someone grabs the other, including those performed by special moves (Chomp, Egg Lay, Inhale, Inhale (King Dedede), Falcon Dive, Dark Dive, Flame Choke, Force Palm, Flying Slam).