On Milos Island, Tornadus and Thundurus continue their fighting after Team Rocket destroyed their shrines. However, Iris has managed to awaken the other Legendary Pokémon; Landorus, to try and qwell the fighting. Ash & Co. however get stuck in the middle of the battle, and things get worse when Team Rocket appear to enact their final plan: the capture of Tornadus, Thundurus and Landorus.

On their way to Mistralton City, Ash & Co. come across the Chargestone Cave. However, when they get within the viscinity of the cave, the Electric-type Pokémon start acting strangely. It appears that the Joltik of Chargestone Cave have appeared and are sucking the electricity out of them. Bianca calls Professor Juniper to appear, but when her Xtransceiver cuts out, things turn out to not be as they seem...