Ash and friends are eating lunch in the woods when they notice that Treecko has wandered off. After failing to convince the Grass-type to come down from a tree, lunch is disrupted by a rampaging Loudred. Its Trainer, Guy finally catches up with his Pokémon and makes it stop.
Ash and Guy decide that both troublesome Pokémon need exercise, so they battle. While battling, both Pokémon evolve at the same time, into Exploud and Grovyle. The battle continues, but Exploud won't listen to Guy. It hits Grovyle hard and runs off.
Grovyle catches up with Exploud at a waterfall, and the two begin to battle again. Exploud still won't listen to Guy. Team Rocket interrupts, trying to capture Exploud, but Guy protects his Pokémon. Pikachu and Exploud send Team Rocket blasting off.
Guy and Exploud reconcile, and Ash and Guy decide to finish the battle.