Mewtwo

Mewtwo is a Legendary Pokémon that can be obtained in the Red, Blue, and Yellow versions of the games. It plays an active role as the antagonist in Pokemon: The First Movie. As the name suggests, Mewtwo is an enhanced clone of Mew; when it discovers this in the aforementioned movie, it becomes enraged and destroys the laboratory.

In the game
Mewtwo, being legendary, is notoriously difficult to capture, leading many players to use their only Master Ball on it. Mewtwo is well-known for its high leveled stats, rivalled by only a few other Pokémon such as Deoxys and Arceus. In the Battle Tower and subsequent competitions, Mewtwo is banned from being used due to its high stats.