Long ago, the Mythical Pokémon Arceus granted a fragment of its awesome power as the Jewel of Life to help Michina Town in its hour of need, only to be betrayed when it was time for that power to be returned. Now, Arceus is returning to reclaim that stolen power, and not even the combined might of Dialga, Palkia, and Giratina can stop its vengeance! Ash and his friends may have discovered a solution-but do they have time to right this ancient wrong and return the Jewel of Life before Arceus destroys everything?