Pokémon the Movie: Diancie and the Cocoon of Destruction

"Diamond mining country". It is a beautiful country deep underground where "Jewel Pokemon" carbinks live in peace. It is said that there is a huge diamond "holy diamond" in this country. The Holy Diamond is an important source of energy to maintain the mining nation and has played its role for a long time. And only Diancy, the princess of this mining country, can create that diamond. But she didn't have that power yet. And ... time is approaching. The life of the "holy diamond" was about to run out. At this rate, this beautiful mining country will be destroyed! At that time, Diancie meets Satoshi and Pikachu and sets out on a journey to find the "Pokemon of Life" Xerneas in search of holy power. Along her way, female thief Marilyn, ninja thief Riot, and Team Rocket attack Diancy's abilities. With the help of parents and children of Millis Argus, the party continued their journey through a pinch, but in their path was the sleeping cocoon of Yveltal, the "Pokemon of Destruction" that once extinguished all life in the Kalos region. ――. An looming crisis !! Can Diancy save her country? And what is the fate of Satoshi and Pikachu !?