Mew (Pokémon), VS Battles Wiki

Because it can use all kinds of moves, many scientists believe Mew to be the ancestor of Pokémon.Pokédex, Pokémon Diamond, Pearl, and Platinum Mew is a Psychic Type Mythical Pokémon. It is said to be the progenitor of all other Pokémon and was the base for Mewtwo's genetic code. Tier: 5-B, higher with Genesis Supernova. Varies up to at least 3-C, likely High 3-A with Transform Name: Mew Origin: Pokémon Gender: Genderless, however, has been referred to as male in Super Mystery Dungeon Age: Unknow

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SPOILER] Pokémon SW/SH thread 2 [SPOILER], Page 5

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Powerscaling Tier List (according to VS Battle Wiki) : r/SmashBrosUltimate