After battling through the depths of Cerulean Cave, you find yourself at its nadir, a secluded cavern with a small mound that seems to be inviting you. You stand up and come face-to-face with the final challenge; Mewtwo. The Pokémon floats slightly off the ground with its arms crossed, its tail swishing behind it. It seems to be waiting for you to make the first move. Its mouth doesn’t move, but you hear its voice in your head nonetheless.

Well? You came here for a battle, did you not?