• English / United States: Otoshi
• Japanese / Japan: サイゾウ
• Japanese (Romanized) / Japan: Saizō
• Japanese (TL) / Japan: Saizo

Otoshi is a Pokemon Trainer that met Ash & Co on their way to the Indigo Plateau. His main Pokemon is a Marowak. After battling with Ash, he admits his badges were stolen. Because of this, his Marowak leaves him in frustration because after all of the hard work attaining the badges, they now have nothing to show for it. After some detective work, Ash & Co and Otoshi figure out that the thieves are Team Rocket and after Marowak returns and a little battling, Otoshi finally gets his badges back.