All you have to do is defeat the Mahogany leader and reach the top of Radio Tower in Goldenrod city.
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I think you have to beat the 6 gym
use the basement key in goldenrod city. the key is in goldenrod.
In the radio tower you will fin d the basement key. After you get it stand in front of the grey part of the door and press A it will open.
you go to team rockets in golden rod to the radio stashon and get to the top floor deefeat the imposter and he will give you the basment key k