Saizou

サイゾウ

On his way to the Indigo Plateau, Ash was intercepted by Otoshi, who issued a battle challenge with a specific condition: the loser must surrender their badges to the winner. Confident in his victory, Ash accepted. Otoshi's Marowak defeated Ash's Bulbasaur, but subsequently lost to Pikachu.
Otoshi then confessed that he possessed no badges to hand over to Ash. Although Ash initially suspected cheating, Otoshi explained that his badges had been stolen by an unknown individual, whom he claimed was a talking Meowth. Ash and his companions recognized Jessie, James, and Meowth of Team Rocket as the culprits. Feeling sympathy for Otoshi, they resolved to assist him in recovering his badges from Team Rocket.
Meanwhile, Marowak fled from Otoshi, stating that if Otoshi were a more responsible Trainer, he would not have lost the badges. Saddened, Otoshi persisted in his search for them.
After Ash, Misty, Brock, and Otoshi confronted Team Rocket, Otoshi challenged Jessie for the return of his badges. She agreed to return them if he defeated her. Using his Doduo, he attempted to beat Jessie's Arbok, but the Doduo's two heads ended up fighting each other. Just as Jessie was about to capture the Doduo, Marowak returned to Otoshi and helped him defeat Jessie.
Reunited with both Marowak and his badges, Otoshi continued toward the Indigo Plateau to compete in the Pokémon League.