Shedinja

A most peculiar Pokémon that somehow appears in a Poké Ball when a Nincada evolves.

Ability — Shell Survival: Put this Pokémon into play only with the effect of Ninjask's Cast-Off Shell Ability. (When you are setting up to play, you cannot put it face down as your Active Pokémon or on your Bench.)

Life Squeeze: Put damage counters on your opponent's Active Pokémon until its remaining HP is 10.