Pokemon Movie 17: Hakai no Mayu to Diancie
English title: Pokémon the Movie: Diancie and the Cocoon of Destruction
Japanese title: ポケモン・ザ・ムービーXY『破壊の繭とディアンシー』
Alternative titles: Pokémon XY: Cocoon of Destruction and Diancie, Pocket Monsters XY: Hakai no Mayu to Diancie, Pokémon XY: Hakai no Mayu to Diancie
Type: Movie
Source: Game
Episodes: 1
Status: Finished Airing
Aired: Jul 19, 2014
Duration: 1 hr 15 min
Rating: PG - Children
Studios: OLM
Licensors: The Pokemon Company International
Genres: Adventure, Fantasy
Demographics: Kids

In the underground Diamond Domain, where many Carbink live, the Mythical Pokémon Diancie serves as ruler. The Holy Diamond that sustains the land is beginning to fall apart, and Diancie is not yet strong enough to create a new one. While seeking help from the Legendary Pokémon Xerneas, Diancie encounters a group of thieves who want to take control of its diamond-producing power–and who awaken the Legendary Pokémon Yveltal from its cocoon in the process! Can Satoshi and his friends help Diancie discover its true power, stop Yveltal’s rampage, and save the Diamond Domain?

(Source: Official site)