Pokemon Movie 11: Giratina and the Sky Warrior

Synopsis:

Parallel to the normal world lies the Reverse World, a distorted place filled with mystery. When an imbalance occurs in the regular world, a black cloud of poison appears in the Reverse World to maintain the fragile balance of time and space. Only one Pokemon, Giratina, lives in the Reverse World; it can travel between the worlds at ease. Angry that Dialga and Palkia’s past battle spread toxic fumes into its world, Giratina comes to the regular world to challenge Dialga, ultimately leading to a tear between the worlds. At the middle of the conflict is the Pokemon Shaymin, a being who is able to absorb the poison. As Ash and his friends are pulled into the fray, they simultaneously try to assist Shaymin in reaching its destination so it can evolve. Meanwhile, in the skies, a lone man named Zero seeks Giratina for his own reasons...