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You need to beat the Pokemon the Elite Four and get 60 Pokemon then go back to Verilion City and go all the way down to the Seagallop ferry and beat the 4 5 6 and 7 islands. Then go back to Elite Four beat it again then go to Cerulean City and that person will move that is in front of that cave don't use the master ball on Mewtwo because if you got charmander as your starter you can caught Sweetcoon if you started with squartle you can caught Rikaue if you started with balbasaur you can caught Entai all three in the wild.

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15y ago

What else can I help you with?