If you give Mewtwo Shadow Ball he'll beat Espeon easily. Espeon can't even learn any attacks that would defeat Mewtwo. The only thing Espeon has going for it is its Speed and Special, while Mewtwo is good in both offensive stats, Speed, and HP. Espeon stats-wise is Alakazam with horrible move compatibility. Although I don't expect Mewtwo to be getting any good attention from females with that mug of his. Then again, Mewtwo doesn't have a gender so he couldn't care less about that.