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Well, I unlocked him by starting an infinite battle, then choosing just any random stage. (I recommend choosing your best fighter. Mewtwo's easy to beat though.) then, leave the game on all night. the next morning, choose [No Contest] on the pause screen by pressing L+R+A+Start. Then, Mewtwo will challenge you for sure if you do this at 8:00 PM.
It takes around 700 VS matches to unlock Mewtwo (a very long time) or rack up 20:00 hours in Combined Vs. Play Time. After you do either, defeat him and he's yours.

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Q: How do you unlock Mewtwo in SSBM?
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