Where's Mewtwo in X/Y?

Question

I just can't remember right now...

Answer 1

It is in a cave near Pokemon village. It is blocked before you beat the E4, but is accessible afterwards.

Comments

Thank you! I think I did see a cave, but I didn't see an entrance.

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From memory you have to surf over the water to get to it (or something like that).

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That's right, you cross the flower fields, go up a ramp, then surf along the river.