One-hit KO

A one-hit KO is a very strong hit that can KO the enemy at 0% damage, but basically all of them are highly conditional, all sharing the following restrictions:


 * The opponent does not tech, double stick 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)
 * Knockback may be insufficient if the attack had been used previously.
 * They are essentially normal attacks, so they can be blocked or dodged as usual.

As such, "one-hit KO" moves are usually just very strong attacks.

Examples

 * Roy's fully charged Neutral B Flare Blade
 * Pichu's fully charged Skull Bash
 * A Smash Attack done by a Home-Run Bat
 * Game and Watch's fully charged Oil Panic, with Ness's PK Flash, or another strong projectile
 * Roy's Counter against certain higher-knockback attacks
 * The explosion from a Banzai Bill
 * The Ultimate Chimera's bite
 * Game & Watch's Judgement Number 9
 * Corneria's cannon laser shots
 * Bonsly, when picked up and thrown
 * Some Final Smashes (only Final Smashes that will KO an opponent at 0%, such as Marth's Critical Hit or Ganondorf's Beast Ganon)
 * The Dragoon, fully assembled.
 * Wario-Man's fully charged Wario Waft
 * Tabuu's Off Waves

There are other attacks than can one-hit KO opponents, but depend on the size of the stage. By extension, the attacks listed above may not KO the opponent if the stage is very large and they are sent from one side to the other.