You go to the stream with pee
It is on the right side of the right painting on the first floor.
The card key in Pokemon Heartgold and Soulsilver is located in the Goldenrod Underground.
in the living room, the first one you enter behind the painting near to the stairs
The Card Key can be found in Silph Co on the Fifth Floor.
The card key is located on the 5th floor of Silph Co in Saffron City.
You get the key card from inside the Silph Co. and head to the 5th floor via the elevator.
You can only get the secret key in Pokemon Platinum
The card key is located on the 5th floor of the Silph Co. building in Saffron City.
You have to defeat a certain Team Rocket Agent and he'll drop the Card Key.
The Card Key is found on the floor of the fifth floor of the Silph Co. building in Saffron City.
If you want to get the card key, you must use the elevator and go to 5th floor. Then done.
you don't, dummy.