Two powerful Pokémon Dialga, who rules over time and Palkia, who controls space, cross paths and battle, distorting the dimensions of time and space and causing havoc to the idyllic Alamos Town. However, everyone are misunderstanding that is caused by Darkrai, a Pokémon shunned by the townsfolk except Ash, Brock and Dawn. Together with Darkrai, Ash and his friends try to fend Dialga and Palkia off and save the town.