X was a Pokémon 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 Pokémon Xerneas and Yveltal, led by Team Flare, forces X outside... Now what? Team Flare uses mind control to force the Vaniville townspeople to transport a huge tree containing Legendary Pokémon Xerneas to help them complete their ! Can X and his friends stop them and rescue Y’s mother from their clutches...? Luckily Trainers Gurkinn, Korrina and Diantha arrive to help—each with a Mega-Evolving Pokémon! Who will be the latest addition to X’s Pokémon team...?