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You must have HM05 Flash to go through Rock Tunnel. Rock Tunnel is to the east of Curlean City. You can get HM05 by going through diglett's cave(and end up near pewter city) and going south to a buiding to which you will find Pro. Oak's aid. If you own 10 pokemon, he will award you with HM05.

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14y ago

What else can I help you with?