Chobin (Japanese: チョビンChobin) is the eager assistant of Dr. Kaminko in Pokémon XD: Gale of Darkness. Chobin speaks very highly of Dr. Kaminko and takes great pride in being his assistant, even though he often fails to see the impracticality of Kaminko's many questionable inventions. He also has a tendency to battle anyone who steps foot on Dr. Kaminko's property, including Michael, as he mistakes them for robbers. He is the only character in the games to have the Trainer classesKaminko Aide (Japanese: カミンコの助手Kaminko's Assistant) and Robo Groudon (Japanese: メカ・グラードンMecha Groudon).
He is first battled upon arriving at Kaminko's House to get Jovi, then battled a second time following Professor Krane's abduction. Later in the game, Chobin picks a third fight with Michael when he arrives to find Makan and get an upgrade for his scooter. After being defeated, Chobin summons one of Dr. Kaminko's inventions, the Robo Groudon, and continues the battle. He continues to use the Robo Groudon in all later rematches, including those in Orre Colosseum, though this bears no impact on his actual skills as a Trainer.