Mew duo, Pokémon Fire Ash Wiki

Mew duo is a fan term for the Legendary duo that consists of the Mythical Pokémon Mew and the Legendary Pokémon Mewtwo. They are both very elusive, if not unique, Psychic-type Pokémon. Mewtwo was cloned from Mew, meaning the two share DNA and many traits. In the game, however, they are usually treated as unrelated Pokémon, with Mewtwo's stats and level up moves being closer to that of the tower duo, while Mew's are closer to that of Celebi. Reports found in Cinnabar Island's Pokémon Mansion note

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