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Mega Arceus
>??? Type (Super-effective against itself, no other weaknesses or resistances)
>+20 Atk, Def, SpAtk, SpDef, Speed
>Ability: Supremacy (All other Pokémon become ??? type and have their abilities negated)
Design looks less like a Pokémon and more like something from Shin Megami Tensei - i.e. alien and disturbing. Arceus's rear limbs and tail disappear, and its ring grows into an elaborate eight-pointed halo attached to its back. It also grows a large number of slender humanlike arms, and possibly a human nose and mouth. Its "hair" points upwards and changes shape to resemble a bishop's mitre.