Now that our heroes and Bianca have returned with Professor Juniper to her base camp in Chargestone Cave, their planned Pokémon trade begins. They first decide to have a battle between Shelmet and Karrablast in order to collect pre-Evolution data. But before they begin, strange electrical readings begin to affect their equipment, causing it to malfunction and putting the battle on hold.
Going deeper into the cave, they discover a distressed Klinklang, who has somehow gotten a pen lodged in its gears! Professor Juniper manages to soothe Klinklang enough to remove the pen, returning it to normal and stopping its electrical discharge. Finally, it’s time for the exchange—Bianca trades her Shelmet for Professor Juniper’s Karrablast, and when both Pokémon evolve as the result of the trade, Professor Juniper has a new Accelgor, and Bianca ends up with a rather surly Escavalier!
The professor suggests having a Tag Battle with their new Pokémon, and she and Bianca team up against Ash and Cilan. It’s a fierce back-and-forth competition, but in the end, Ash’s Boldore and Cilan’s Crustle emerge victorious! At first Bianca is disappointed with their loss, but Professor Juniper explains that the Tag Battle was intended to help Bianca and Escavalier learn to trust each other. Bianca happily thanks her and bids them all a speedy farewell.
Suddenly, out of the cave staggers none other than Professor Juniper’s father, Cedric, who collapses in front of them...