The truth behind the new Pokémon that resembles Mewtwo is clear. It’s a Mewtwo that has achieved Mega Evolution, a new kind of Pokémon Evolution! The Mega Mewtwo shown here is Mega Mewtwo Y. Use the Mewtwonite Y Mega Stone to evolve Mewtwo into Mega Mewtwo Y.
Its streamlined body always appears to be floating in the air.
Mega evolves from Mewtwo during battle.