Few days ago, some scientists successfully used the dna of Mew The ancestor of all Pokemon to create Mewtwo, World's strongest Psychic Type Pokemon created by Man-Kind! But, Mewtwo used its power to escape.

Few days later, you were in Cerulean Cave but you suddenly saw Mewtwo! Mewtwo uses its telepathy powers to speak to you.

Human, why are you here? I distrust human species as they created me for the soul purpose of power using the dna of mew. You should leave me alone.