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
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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.
I think you have to beat the 6 gym
The secret key is in the Pokemon mansion (Cinnabar Island) in the basement.