X, hiding from media attention after winning the Pokm̌on Battle Junior Tournament, is compelled to come out when a pair of legendary Pokm̌on and a shady organization attack his hometown of Vaniville.

"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 of Vaniville Town by Legendary Pokémon Xerneas and Yveltal, led by Team Flare, forces X outside... Now what? X, Y and company meet Trevor's online friend Professor Sycamore...but X is suspicious of him. Trevor sets out to get his Holo Caster repaired by Lysandre...who turns out to be another...