Crisis at Chargestone Cave!

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...