Mewtwo is identified as the Genetic Pokémon in the first-generation Pokédex.
Mewtwo is a Legendary Pokémon first introduced in Pokémon Red and Blue. Its design and story connect it to Mew, whose genetic material was used in the experiments that created Mewtwo. The result is a powerful Psychic-type Pokémon with a backstory centered on laboratory science and genetic manipulation.
In the original games, players learn about Mewtwo through research documents in the abandoned Pokémon Mansion on Cinnabar Island. After escaping, Mewtwo resides in Cerulean Cave, making it a late-game discovery and one of the rarest encounters in the first generation.
Mew and Mewtwo are frequently confused because their names and stories are linked. Mew is the Mythical Pokémon numbered 151, while Mewtwo is numbered 150 and is the species described as the Genetic Pokémon. The “two” in its name reflects its relationship to Mew rather than a simple evolutionary stage.