Baku, known as Buck in English-language releases, is a Pokémon Trainer from Sinnoh's Survival Area. He specializes in training Pokémon with high Defense and Special Defense stats. Baku frequently trains at Stark Mountain, Sinnoh's volcanic region, preferring its challenging environment to test his defensive strategies. He is the younger brother of Flint, a Sinnoh Elite Four member, and his grandfather runs the Survival Area's Battleground facility. His expertise with sturdy Pokémon is a consistent character trait. Baku appears in the series episode "The Magma Stone." There, he partners with Detective Looker to confront remnants of Team Galactic, led by Charon, at Stark Mountain. Charon attempts to awaken and control the Legendary Pokémon Heatran, posing a significant threat. Baku actively intervenes, using his Claydol to battle the antagonistic forces and help thwart the plan to misuse Heatran, demonstrating his commitment to regional stability. This confrontation highlights his willingness to collaborate with international authorities like Looker against criminal organizations. His knowledge of Stark Mountain and battle skills are instrumental in the incident. His relationship with Flint forms part of his background, though their dynamic isn't explored in depth. His character is primarily depicted within this Stark Mountain incident and does not undergo significant development or appear beyond this episode in the documented material.