Ash Ketchum, Dawn, Brock and their Pokémon arrive in Michina Town where they meets and makes friends with Kato, Kiko, Sheena and Kevin. After they hear Sheena's story that her ancestor Damos stole the Jewel of Life from Arceus, creator of the world and now Arceus returns to pass judgement on humanity, they decide to travel back the time to discover and possible reverse the events that led to Arceus' vendetta.