An idyllic town is thrown into chaos when two powerful Pokémon, Dialga and Palkia, cross paths and battle, distorting the dimensions of time and space. The only hope comes from Darkrai, a shadowy Pokémon shunned by the townsfolk.
When a new Pokèmon emerges able to create parallel dimensions, it's up to Ash Ketchum and his friends to stop a mysterious stranger from using its powers for evil!