After defeating Conway, Ash has now progressed to the Top 8 in the Sinnoh League, and it's finally time for him to go up against Paul in the Sinnoh League battle promised after Monferno's evolution. With the return of Gliscor, Ash decides to use the same Pokémon he used in his full battle with Paul at Lake Acuity, determined to show that they have grown considerably since then. The time has come; will Ash finally be able to defeat the rival he made when he first set foot in the Sinnoh Region, and progress even further in the tournament?
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.