Mawile had their fans from the start, of course (myself included! Base Mawile are still super cute), but the mega they received really took their power up several notches more than most, and it's got one of the prettiest designs as well. Gardevoir was a decent sweeper from the start, meanwhile, and likely wouldn't see the big deal as clearly, +40 SpATK or no +40 SpATK.
As has been explored many times, they also don't do frontal hugs like that. You'll poke your eye out, Mawile!
