The struggle of time and space—of distorted worlds and alternate dimensions—continues to rage, with Ash and friends once again caught in the middle!Michina Town is at the heart of the action. The town has a long history and checkered past in relation to the mighty Arceus. After Arceus granted the townspeople some of its power as the Jewel of Life, they betrayed the Mythical Pokémon!Ash and his friends, accompanied by their new companion Sheena, travel in time with Dialga’s help to right the mistakes of the town’s ancestors before the world crumbles under the power of Arceus’s rage. Did Sheena’s ancestors truly betray Arceus? Will our heroes be able to fix the mistakes of the past?