Pokemon the Movie 17: Diancie and the Cocoon of Destruction

In a country called "Diamond Domain" lies the powerful Heart Diamond, which has served as the kingdom's source of energy and maintained the Ore Country for centuries. Many Carbink live in Diamond Domain, including their princess - the Jewel Pokemon, Diancie, who created the Heart Diamond. Diancie no longer has the power to control the Heart Diamond and her country is falling into chaos as a result. One day, Diancie meets with Ash and his friends and asks them to go on a journey to find the Life Pokemon, Xerneas, in order to restore the Heart Diamond. Standing in their way is the Pokemon of Destruction, Yveltal, who once stole all of the life in the Kalos Region.