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Answer from: RhyannTheGreat
Simply, when you defeat them at Mahogany town go to the Radio Tower at the Goldenrod City. When you are done to the last "Rocket Executive" he will give you the Basement Key. Go straight to the Underground Path at the same city you will noticed there that the door is locked, when you face the door press A and the Door will open. Then fight them all!
Posted on: 04-30-2014