You have to beat the all of the rockets. Press A on one of them and he drops it
beat a team rocket on floor 4 talk to him after you beat him and you get the key
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
beat a team rocket on floor 4 talk to him after you beat him and you get the key
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.
In Pokémon Colosseum, you can obtain the elevator key in the Cipher Lab. After defeating the two Go-Rock Squad members in the lab, you'll find the key on a table in the room. This key is essential for accessing the elevator that leads to the upper levels, where you'll confront more of Cipher's forces.
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 are never unable to use the elevator in Pokemon.
you can not
You're in team rocket base, right? If you are then keep defeating people until one says "whoops I dropped it" then you pick it up and there you have it you can use the elevator.
You don't
At the elevator key store. xP