Ash meets a strange old man named Flint, who instructs him in the etiquette of Pokémon training and the rules of the Pokémon League. To enter the League, trainers must collect badges from gym leaders, like the gym in Pewter City run by Brock. Ash quickly challenges Brock to a match and loses. After intense and strange training from Flint, Pikachu battles again and wins, earning Ash a Boulder Badge and a new friend - Brock.
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.