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Leon is actually the anonymous leader of team Yell, who goes by "Marnie". Leon uses the power of fandom/stans to slander and defame any trainer he perceives as a strong enough threat to his title, and make them lose sponsors. In the past, Leon battled Sonia for the title of champion but he felt like Sonia threw the match, which left him feeling weak. His goal is to capture the other version's legendary doggo to make himself feel strong. However, doing this allows Eternatus, the third legendary, to roam free and wreck shit.