red or firered?
if firered, do you mean the rocket basement? its in the game corner. go up to the poster the rocket guy is standing in front of and press a
the basement
the key is in the basement of the pokemon mansion
basement of game corner in celadon city from giovanni
You have to go into Pokemon mansion. Find the key in the basement.
There is a basement lab with a bunch of scientist and wild ditto, there is an item ball with the key in it.
Just go to a Pokemon center, go to the basement and trade.
There isn't a basement. There is only the first floor.
There is no basement of the Old Chateau.
In the basement of any Pokemon center
you find the basement key in the underground path
in the mansion, where you find the black space, jump down into i, you get to the basement by jumping from the platform furthest to the right
In the basement of the Pokemon center.