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	Aether and Eruption	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.
Bowser	Forward Smash, Bowser Bomb and Giga Bowser (Final Smash)	Giga Bowser has it for the entire period of being Giga Bowser. Bowser Bomb - Only during ascension time.
Snake	Cypher	Entire move, although can be broken by strong moves such as Bowser's Forward Smash.
Marth	Dolphin Slash	First 4 frames only.
Donkey Kong	Giant Punch and Carry Throw	Giant Punch - Only if fully charged.
Ganondorf	Flame Choke	When he is holding the opponent above him. Opponent also gets super armor.
Pokémon Trainer (Squirtle, Charizard, Ivysaur)	Fly, Withdraw, and Squirtle's Forward Smash.	Ivysaur has no super armor moves.
King Dedede	Super Dedede Jump	Only during ascension time.
Pit	Mirror Shield	Only as he pulls the shield out.
Olimar	Pikmin Order	During the beginning.
Lucas	PK Thunder, PK Fire, PK Freeze	During very beginning frames.
Wario	Forward Smash, Wario Waft
Yoshi	Double-Jump	During ascension time when he is moving with it.
Anyone	Grabs, Chomp, Egg Lay, Inhale, Inhale (King Dedede), Falcon Dive, Dark Dive, Flame Choke, Force Palm, Flying Slam	At the beginning when someone grabs the other, including those performed by special moves.