Ash and friends arrive in the beautiful ancient Michina Town. Although the town seems peaceful, Pikachu and Piplup are suddenly sucked into a vortex. A girl named Sheena arrives and uses her powers to summon Dialga to save them. Then, Sheena’s friend Kevin tells everyone that Dialga and Palkia’s battle in Alamos Town has caused the Legendary Arceus to start awakening, and she also tells everyone about how her ancestor betrayed Arceus, and she hopes to correct his mistake. When Dialga falls prey to one of Arceus’s vortexes, Sheena summons Palkia to save it. This in turn alerts Giratina, and the three continue their vicious battle. Sheena uses her power to quell the fighting, and the three finally resolve their differences. However, Arceus eventually awakens and begins to destroy Michina Town. Sheena summons Dialga, Palkia, and Giratina to defend the town, and when it is revealed that the Jewel of Life she posses is fake, she and the others decide to travel back into the past in order to get the real Jewel of Life and make sure Sheena’s ancestor does not betray Arceus.