One-Hit Knockout Moves are moves that are guaranteed to wipe out the foe in one hit. Numerous Pokémon can learn them. A pre-requisite to the success of this move is that the attacker must be equal to or higher than the level of the opposing Pokémon. Also, 1 hit KO moves, have of the lowest accuraccy in the game. Many were first introduced as a legendary-only-pokemon-landmark-move, such as sheer cold and fissure.