On Mt. Coronet, Ash and Turtwig are battling Alan, an energetic Trainer with a Nosepass. The only place Nosepass can evolve into Probopass is Mt. Coronet, so Alan is eager to have all the battles he can. Sure enough, Nosepass evolves during the heated battle, but Alan's delight is short-lived: a strange device lands on Probopass's head and causes it to act strangely, even turning against Alan! It's all the work of Team Rocket and their new Probopass Power Mind Manipulator antenna, which they use to control Probopass so they can steal it and run away.
Alan is heartbroken, but Ash and his friends promise to help him rescue Probopass. They track Team Rocket to the bank of the river, and Ash sends Buizel to cross the river and steal the antenna remote control. When Buizel is spotted, a fight breaks out that damages the remote control! As Probopass runs away, so Alan leaps on its back and tries to bring it back to its senses. He even has Pikachu shock them with Thunderbolt, but nothing works.
Finally, Alan asks our heroes to knock him and Probopass into a lake, where he finally manages to pry the antenna off and restore Probopass to normal. But back on shore, Team Rocket has snared Ash and his friends in a net. When Alan, Probopass, and Buizel surface, Buizel cuts everyone free with Sonic Boom and Probopass helps our heroes defeat Team Rocket. With that done, Alan and Ash resume their battle!