Leon is known far and wide for taking part in the Gym Challenge at the tender age of 10 years old—and even more so for claiming victory in the Champion Cup on his first attempt. Ever since that victory, he and his partner Charizard have remained unbeaten in both League and exhibition matches. He is called "the unbeatable Champion" and is a hero to many Trainers. He has but one weakness: a dismal sense of direction. Leon's dream is to make Galarian Trainers the strongest Trainers in the world.