its while sence i playd the games but if i remmember right you get the basement key when you have defeated the head team rocket grunt att the radio tower after that he will give you the key butt remmember he is hard so train before you try the radio tower i whoult recoment
you use it to open the door to the basement!
You should iook it up on youtube and do it from there
It opens the basement region of the farm. If you finish the basement at the end there will be a dig spot and a silver key in the dig spot there is the enforcer a legendary gun.
beat exacutive patral in the radio tower and he gives you the key.
The basement key is used in the Goldenrod underground. You get it while rescuing the Radio Tower from Team Rocket - specifically, after defeating a Rocket Executive disguised as the director.
After you get the basement key, you go into the tunnel that is under Goldenrod City and you go to the end of the branching off hallway. There, there is a locked door, where you use the basement key and the door opens, if you get all the way to the end of the tunnel behind the door, you find the director there.
you find the basement key in the underground path
you battle him
The basement key can be found in the room with projector. The projector shows animals that correspond with pictures of animals in the room that can be pressed. Press them in the correct order to reveal the basement key.
the key is in the basement
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the key is in the basement of the pokemon mansion