The Pokemon Company International posted the English-dubbed trailer on their official Youtube page for the upcoming film "Pokémon the Movie: Diancie and the Cocoon of Destruction".

While some prefer the English dub of Pokemon, some fans of the show swear that the Japanese version is better. This is the Japanese version of the trailer so you can decide which is the better version.

The film will premiere on July 19 in Japan. The Pokemon Company describes the story:

"In the underground Diamond Domain, where many Carbink live, the Mythical Pokémon Diancie serves as ruler. The Heart 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 Ash and his friends help Diancie discover its true power, stop Yveltal's rampage, and save the Diamond Domain?"

Pokémon the Movie: Diancie and the Cocoon of Destruction will play alongside the short film, Pikachu, What's This Key For?, which introduces four Pokémon.