beat a team rocket on floor 4 talk to him after you beat him and you get the key
You have to beat the all of the rockets. Press A on one of them and he drops it
If you want to get the card key, you must use the elevator and go to 5th floor. Then done.
You don't
A rocket grunt drops the key on B3.
You beat a grunt, and when you beat him he drops the LIFT KEY and you can use it to get to the top floor and face Giovanni ;D
You have to beat the all of the rockets. Press A on one of them and he drops it
In pikachu's snatch
the giant pokeball on the arena floor is an elevator to the pre gym basement. you need the elevator key to get in.
You get the key card from inside the Silph Co. and head to the 5th floor via the elevator.
You can get the elevator key by the second to last floor in the shadow machine place(in the room where that scientist is at)
If you want to get the card key, you must use the elevator and go to 5th floor. Then done.
you can not
You are never unable to use the elevator in Pokemon.
You don't
At the elevator key store. xP
The Rocket Key is the Elevator Key that powers the elevator in the Celadon City Rocket Headquarters, under the Game Corner.
With the secret key which is found in the Pokemon mansion.