>>49557119>headcanon, Leon is strongest in galar and nothing else10-0 record against Raihan.
Raihan being strong enough to be champion in regions outside Galar isn't headcanon, but out and out implied by the game.You can talk about it being "rumored", it's still better than what most characters in the franchise actually have.
>even thats debatable because of MustardRose, the brother of a Champion and a runner up for the position himself, says Leon is the greatest champion they've had(and he does so when crowds are not listening).
Opal, Mustard's own rival, describes Leon's talent to be beyond anything she has ever seen.
Mustard being stronger than Leon is actual headcanon, there's actually no basis whatsoever for it in Sword and Shield.
You'd have an easier time arguing Mustard against any other champion.