How do you get into the cave with Mewtwo in it. The man at the door won't let me in he says something about doing something special please help!
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Beat the Elite Four then give the Ruby and Sapphire to Celio!
Give the Ruby and Sapphire to Celio after beating the Elite Four.
You have to give the Sapphire Gem to Celio on one of The Islands. I forget which one. But once you give it to him the cave should open and you should have access to catch Mewtwo.
I hope this helps.
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