X was a Pokemon 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 Pokemon Xerneas and Yveltal, led by Team Flare, forces X outside... Now what?
As the Gym Leaders desperately try to prevent Team Flare from unleashing their Ultimate Weapon on the Kalos Region, our friends Trevor, Tierno and Shauna meet a mysterious stranger who reveals vital information about the weapons' arcane history. Then, when Legendary Pokemon Xerneas awakens, it looks like an epic battle with Legendary Pokemon Yveltal is about to start. So why is Blue searching for a Legendary Pokemon whose name starts with a "Z..".?