Pokémon the Movie XY: Hakai no Mayu to Diancie  

Pokémon: Diancie and the Cocoon of Destruction, Pocket Monsters, Pokémon the movie XY 破壊の繭とディアンシー

In the subterranean Diamond Realm, where numerous Carbink dwell, Diancie reigns as sovereign. The Heart Diamond that sustains this realm is deteriorating, and Diancie lacks the strength to construct a replacement. While searching for aid from the legendary Pokémon Xerneas, Diancie stumbles upon a gang of thieves who covet its diamond-generating abilities and inadvertently awaken the legendary Pokémon Yveltal from its slumber in the process! Can Ash and his companions assist Diancie unlock its hidden potential, halt Yveltal's rampage, and preserve the Diamond Realm?

Pokémon the Movie XY: Hakai no Mayu to Diancie was published in English as Pokémon The Movie: Diancie and the Cocoon of Destruction by VIZ Media on February 3, 2015.