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I don't know if it's the same as in Sapphire but I think you have to go to Mauville City and get the Basement Key off the gym leader there, Wattson, then go down to wear the man is fishing. Use surf there and go right. You will come across 2 islands one that has a tree and a sign saying something like
'Team Aqua was here, but scribbled oover was, Team Magma Rules!' Surf some more and on the next island there is a metal door, and that's where you use the basement key.
What else can I help you with?
How do you use the basement key in Pokemon gold?
oh hai
Where do you get a magnet in Pokemon emerald?
where you use the key to turn on the quary.
How do you unlock the door in goldenrod city in Pokemon gold?
use the basement key in goldenrod city. the key is in goldenrod.
Where do you use basement key at Pokemon soul silver?
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.
How do you unlock blaines gym on Pokemon Blue?
You need to acquire the Secret Key that can be found in the basement of the Pokémon Mansion and then you can use the Secret Key to enter into Blaine's Gym.
