Ditto

Attacks

Surprisingly Transform
Flip a coin. If heads, search your deck for a Pokémon and switch it with this Pokémon. Any attached cards, damage counters, Special Conditions, turns in play, and any other effects remain on the new Pokémon. If you switched a Pokémon in this way, put this card into your deck. Then, shuffle your deck.

It can freely recombine its own cellular structure to transform into other life-forms.