New Mewtwo-Like Pokémon Revealed For X And Y - Game Informer

The official Pokémon X and Y website has been updated with a new Pokémon that is "strangely familiar".

Mewtwo Poke-Navi

Lucario - Wikipedia

New Pokémon X &Y trailer reveals starter evolutions and new Mega Mewtwo form - Vooks

Mewtwo Poke-Navi

When Pokémon fans begin their thrilling 3D adventure in Pokémon X orPokémon Y this October, they will be transported into an entirely new region

Pokemon Y

Pokémon: Let's Go, Pikachu! and Let's Go, Eevee! - Bulbapedia, the community-driven Pokémon encyclopedia

Pokémon X Preview - New Pokémon X & Y Trailer Reveals Trainer Customization, New Mewtwo Mega Evolution - Game Informer

Mewtwo Poke-Navi

Analyzing The New Mega Pokémon - Game Informer

Pokémon X & Y (2013), 3DS Game

Pokémon X & Y's new reveal looks a lot like Mewtwo