If you’ve received at least one video game Play! Point during the 2016 season, an ultra-rare Pokemon can be all yours. Qualified participants have begun receiving codes to download Shiny Mewtwo in Pokemon X, Y, Omega Ruby or Alpha Sapphire. This Mewtwo is equipped with its Hidden Ability, Unnverve, which prevents the opposing Pokemon from eating a held Berry. It is also holding the Mewtwonite Y Mega Stone, allowing it to Mega Evolve during battle.
Shiny Mewtwo codes are now being sent to qualifying Pokemon players
Pokémon Blog 