Suggested by Sonic Yellow Devil is one of the original Mega Man villains. The guy has gotten several powered up modes over the years as well. His main drawback here is just that the guy isn’t particularly fast. Celebi will definitely be able to stay one step ahead of him and pepper the guy with elemental blows. Celebi knows hundreds of different attacks thanks to being an all around legendary type and as a result wouldn’t have a big problem dodging Yellow Devil while dishing out the pain. Celebi wins.