X was a PokÔemon Trainer child prodigy. But now he's depressed and hides in his room avoiding everyone-- including his best friend Y. An attack on their hometown by Legendary PokÔemon Xerneas and Yveltal, led by Team Flare, forces X outside. Now what? Y and friends are attacked by Legendary PokÔemon Yveltal while X and Blue are attacked by Legendary PokÔemon Mewtwo! Why has Mewtwo come to PokÔemon Village, a sanctuary for refugee PokÔemon? And why is Mewtwo so angry? Then, the mysterious test subject trapped inside the Essentia Expansion Suit regains consciousness.