Join Ash accompanied by his partner Pikachu, as he travels through many regions, meets new friends and faces new challenges on his quest to become a Pokémon Master.
After watching Elite Four member Bruno on TV, Ash and his friends decide to do training in the mountains to be as strong as Bruno. However, they meet Bruno and he manipulates them to do some menial tasks for him. Meanwhile, a giant Onix is on a rampage.
While training, Ash and his friends accidentally uncover the ruins of Pokémopolis, an ancient city. After a bit of research, they find a giant Gengar and a giant Alakazam starting to fight. Then, a giant Jigglypuff appears to put them to sleep.
Ash and his friends offer to help a trainer that is heading for the Pokémon League to retrieve his stolen gym badges from Team Rocket.
Ash finally reaches the Indigo Plateau, home of the Pokémon League conference. Before the tournament begins, they plan on lighting a ceremonial cauldron with the flame of the legendary Pokémon, Moltres. Ash, as a participant, is free to carry the flame but when Team Rocket steals it, the tournament may be cancelled.
Ash enters his first match of the tournament on the water field against Mandi the Astounding. During the battle against Mandi's Exeggutor, Ash's Krabby evolves into Kingler, who he then uses against Mandy's remaining Seadra and Golbat, winning the match and moving onto the next preliminary round.
For the second round Ash battles in the rock arena. Ash's last Pokémon, Squirtle, defeats his foe's last Pokémon, Nidorino, and he, victorious, moves on to Round 3. In the third round Ash faces a trainer named Pete in the ice arena. Both trainers are left with 2 Pokémon each. Pete uses Cloyster and Arcanine. In the end, Ash is victorious and he moves on to Round 4.