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?

Meowth takes a break from trying to capture Pikachu to spend time in Big Town. But his dream project to build a golden statue gets off to a bad start when he loses his picnic basket in a series of mix-ups. And then to pay for it he gets some jobs, but makes the Pichu possé to do the work. This story is continued in "Trouble In Big Town."

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.

With two days left in Big Town, Meowth gives up on his statue, and just wants to eat his tuna fish sandwich, which then mysteriously runs away from him. Then, the next day, he tries to woo a Skitty while the Pichu Brothers chase after an Azurill.

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.

Jessie, James, and Meowth weren't always together. They once were solo. They were of youth and didn't know much about Pokemon. This episode explains how and what brought them as one team.

Celebi is back. This time, it is spotted by Richie. He is able to indentify it, but he is wondering why it appeared to him. Richie is confused because Celebi guides him into the woods, where it's symbol of rememberance is located. What might be the reason, Celebi brought Richie with him?

A new Pokemon Trainer is coming. It will be his first Pokemon, but he doesn't know which Pokemon to choose. After a small incident, he selects a Pokemon. The trainer is excited with his new Pokemon and the journeys that they will experience.

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.

Misty and Daisy each have a new Luvdisc, but only one loves the other. To make matters worse, Butch and Cassidy steal them for Professor Nanba, who plans to use them to rid the world of love forever. Notable for the one of only three times that Butch is called by his proper name.

Casey meets the pitcher for her favourite baseball team, the Electabuzz. He left due to a shoulder injury, but has lost the fire to perform, while his Charizard has literally lost its fire and ability to fly. She must restore the fighting spirit to both of them.

While taking a voyage on the SS Anne, Ritchie meets a trainer called Silver, who is on his way to battle Moltres with two Professors from the Bogus Fake University of Science. However, the "professors" are really Butch and Cassidy, and they want to capture Moltres for Team Rocket.