Ash and friends arrive on Mt. Coronet where Ash engages in a battle with a boy named Alan and his Nosepass. When the battle leaves the mountain, Alan says they must stay on the mountain in order for Nosepass to evolve. Eventually, Nosepass evolves into Probopass. Before the battle can continue, Team Rocket arrives and puts a device on Probopass, which turns it against Alan, and allows it to go with them. Team Rocket plans to make more controlling helmets in order to gain an army of Probopass. Meanwhile Ash and the others begin formulating a plan to get Probopass back.