Brock's Mudkip evolves into Marshtomp while training with Grovyle, but when it shows off its Mud Shot attack, it accidentally hit s a nearby Flaaffy! Luckily, Flaaffy's owner, Mariah, works at a pharmacy that makes Pokémon medicine. Soon Flaaffy is well, but Marshtomp has developed a crush on it! Mariah and her friend McCauley are helping the pharmacy's doctor, using Electric Pokémon to help make medicine. It's not easy, and McCauley is really starting to doubt his abilities.

A disguised Team Rocket tries to clean out the pharmacy using Meowth in a Snorlax suit, but McCauley and Brock drive them off. Team Rocket doesn't give up: later that night, they return with a rocket-powered balloon and steal the entire building while Mariah and Flaaffy are still inside! McCauley and his Ampharos leap into the building as it's carried off. Back on the ground, Ash and his friends try to stop Team Rocket, but Pikachu and the doctor's Mareep are hurt when Marshtomp's attack is deflected by Team Rocket's latest device.

Up in the flyaway pharmacy, McCauley and Mariah mix up a Pokémon medicine, then toss it to the doctor. The hurt Pokémon are restored to full health, and the Electric Pokémon pool their power to defeat Team Rocket. McCauley now has confidence in himself, but poor Brock and Marshtomp realize that romance with Mariah and Flaaffy will never pass! Yes, everything's definitely back to normal as our friends head towards the next stop on the Battle Frontier!