Ash is preparing for his battle at the Virbank Gym at the Pokecenter where he sees many trainers enter with poisoned pokemon. He learns that the gym leader of the Virbank Gym specializes in Poison-type pokemon and should come up with a strategy to avoid poisonous attacks. The gym leader, Roxie suggests that Ash should use six pokemon in his battle while she uses three pokemon.
A young boy named Ash Ketchum embarks on a journey to become a "Pokemon Master" with his first Pokemon, Pikachu. Joining him on his travels are Brock, a girl-obsessed Rock Pokemon Trainer, and Misty, a tomboyish Water Pokemon Trainer who may have a crush on him. Ash and Co. end up traveling through various regions, including Kanto, the Orange Islands, and Johto, and then enter the Pokemon League competitions there.
Along the way, they run into many confrontations with Jessie, James, and Meowth, a trio of Pokemon thieves who are apart of an evil organization called "Team Rocket". But every time Team Rocket try to do their evil deeds, they fail thanks to Ash and his Pokemon.