Mew

Psychic 50 HP Stage: Basic Rare Holo

Encounter

Search your deck for a Pokémon, reveal it, and put it into your hand. Shuffle your deck afterward.

Memories of Dawn

This Pokémon can use the attacks of any of your Basic Pokémon in play. (You still need the necessary Energy to use each attack.)

Its DNA is said to contain the genetic codes of all Pokémon, so it can use all kinds of techniques.