Substitute

Substitute (みがわり Scapegoat) is a move that, when used the Pokémon will make a substitute of itself, at the cost of 25% of its HP. The substitute will take the damage from the opposing Pokémon until it breaks. A substitute cannot be created if your Pokémon's health is less than 25% of its maximum HP. A one-hit KO attack will always break a substitute if it hits. Interestingly, in Generations 1 and 2, the Substitute takes the appearance of a Rhydon. In all subsequent games it is a plush toy that resembles no particular Pokémon.