Brock returns home to Pewter City to find that the gym has been converted from a Rock gym to a Water gym, by his mother. Now Brock has to fight to get the gym restored to it's normal state. Meanwhile, Brock ends up leaving his Pokemon with his little brother. He is off to the Hoenn Region.

Misty is glad to return to the Cerulean Gym. A gym leader for the gym has not appeared in a while, so the gym is in danger of closure. One of Misty's worst fears is a Gyarados, but now she has to cope with it because it is loose in the gym.

A village is in danger of a huge robot, about to ruin their crops. Team Rocket end up landing in the village, so the people, hope they will stop the robot, before any destruction of the crops. Jesse, James, and Meowth manage to stop the one robot, but more come leading to more complications. To add to the problems, a huge swarm of Taillow are flying in that direction.

Butch and Cassidy, also members of Team Rocket, return. They are in search for Pokemon, but in Oak's lab. Will Ash be able to stop them? Meanwhile, guess who's back, the Magikarp Salesman. This time he tries to sell Pokemon to another person.

Sakura returns, asking Misty, ""could she battle her?"" Misty gladly approves, but she is out of badges. She goes to get some created, where she is taught herself, but she encounters trouble. Sakura helps battle the bad guys. Will she be able to win a Cascade Badge from Misty, though?

Richie returns with a new Pokemon. Butch and Cassidy also come back (with new Pokemon), but they are up to no good. They capture Oak. It is up to Richie to save him. Later on, Richie thinks about traveling again, so he leaves to go to the Hoenn Region.

Richie returns with a new Pokemon. Butch and Cassidy also come back (with new Pokemon), but they are up to no good. They capture Oak. It is up to Richie to save him. Later on, Richie thinks about traveling again, so he leaves to go to the Hoenn Region.

Misty receives a guest to the gym. This guest happens to be Casey, the girl who loves Electabuzz. Lily, Violet, and Daisy, sisters of Misty, also come back to manage the Cerulean Gym. Meanwhile, Cassidy and Butch are up to no good, again. They are looking to take someone's Pokemon, but they are defeated. It all ends well for everyone, except Misty, because she no longer is the leader of the Cerulean Gym.

Misty receives a guest to the gym. This guest happens to be Casey, the girl who loves Electabuzz. Lily, Violet, and Daisy, sisters of Misty, also come back to manage the Cerulean Gym. Meanwhile, Cassidy and Butch are up to no good, again. They are looking to take someone's Pokemon, but they are defeated. It all ends well for everyone, except Misty, because she no longer is the leader of the Cerulean Gym.

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Gary has become a Pokemon Researcher. He is trying to discover more facts and information about Pokemon. He meets an Aerodactyl, in which Team Rocket are looking in taking, since it is rare. Gary, Oak, and Tracey have to make sure Aerodactyl stays safe because Team Rocket have it.

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