I'm guessing Ganondorf was somewhere else being devious, and Isabelle was home taking care of the horde of children who shouldn't be playing with scythes or smashing themselves to the sky. Little Mac, Luigi and Megaman dead.
This thing had almost as many hands as there are pokemon, it reminded me of an Arceus reference. The inner part of the wings was like the epilepsy part of final destination of smash four. The sun and the blue star crashing, the 3ds and wiiu versions, red and blue in conflict.
With the actual figthers gathered in one place, it was easier to expend it's limbs and guarantee a kill on 99% of the cast.
Kinda want a battle where you fight 10 master hands in a row now.
In shin megami tensei lore, this thing would be an agent of order, and in around 700 right hands, not a left one.
And in the end, it doesn't matter how many times your soul has defeated the king of evil, how many evil surprise dragons your lineage has beaten, how many planets you have blown up, how many angels or demons, or aliens, or alternate versions of yourself, or gods you beat, how strong your magic, your psychic powers, your body, your tactics, your weapons, your guts, your spirit. You don't mess with the pink blob who has beaten over 10 eldritch abominations.