Indeed, I feel tempted to side by It too. I wonder what Mewtwo's prime fear would be...maybe a human who has enslaved several mighty pokémon and who's skilled enough to defeat him in a battle? Or a sapient, malicious Master Ball like FFD jokingly suggested?
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Currently playing: League of Legends, Chrono Cross.
Current Projects: Fool's Overture, CYOA: http://www.gamefaqs.com/boards/8-gamefaqs-contests/60143513