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A century ago, the power of a mighty creature known as Hoopa, who is capable of single-handedly defeating legendary Pokemon, was captured in a bottle by a lone traveler. The bottle was then hidden deep inside a cave in the desert, in the hopes that the darkness sealed within it would never see the light of day again. Years later, a young man finds the bottle and breaks the curses surrounding it, releasing the power confined within it. Its contents take the form of Hoopa's shadow, and it uses its unbound power to shatter the bottle and prevent anyone from capturing it again. The shadow then goes on a rampage and attacks the original Hoopa, while both Pokemon summon other legendary creatures to aid them in their brawl. Satoshi—a budding Pokemon trainer from the Kanto region—and his friends are caught up in the crossfire, and must now work to stop the ravaging Pokemon, or face a devastating clash of legends. [Written by MAL Rewrite]

Prequel to the 17th Pokémon movie, Pokemon XY: Cocoon of Destruction and Diancie.

The story is set in Diamond Ore Country, of which Diancie is the princess.This is a country located deep underground, where the Pokémon Carbink live together in peace. The energy source of this country is a giant diamond called the Sacred Diamond, which can only be created by princess Diancie. However, the current princess doesn't yet possess the power to create such a diamond, and the current Sacred Diamond's power is soon going to run out, which would result in the end of the country. Diancie meets up with Ash and Pikachu, and set off together with them to search for the legendary Pokemon Xerneas, which possesses sacred power, but on the way, they find the cocoon where the Destruction Pokémon, Yveltal, who was said to have once destroyed life in Kalos, lies in wait. (Source: serebii.net)

A mysterious force binds Ash to the Mythical Pokemon Volcanion when it falls from the sky. Volcanion can't get away, and Ash is dragged along as it continues on its mission. They arrive in a city of cogs and gears, where a corrupt minister has stolen the ultimate invention: the Artificial Pokemon Magearna, created 500 years ago. The minister plans to use Magearna's mysterious power to take control of the mechanical kingdom. (Source: ANN)