>>41891629Mega fug is definitely one of the strongest if not the outright strongest, dude literally used prayers to transform into one of the most disgustingly powerful pokemon ever, and even if you don't take his mega into account he still spends his time in the stratosphere just looking for meteors to eat. Hoopa Unbound was also shown beating the fuck out of every other legendary, but that's movie canon so it may not count.
