The Card Key for Silph co. is on the fifth floor of the building. The Lift key for Rocket Game corner is in Basement Floor 4, at the very top, you must battle the trainer.
In order to get the Card Key in "Pokémon HeartGold," you need to get to the Director who will be in the Underground Tunnel in Goldenrod City after Team Rocket has taken over the Goldenrod Radio Tower. The Director will give you the Card Key which will open up a Card Key door in the Radio Tower which will assist you in defeating Team Rocket.
You go to the top floor where there will be a team rocket guy dressed as the director. Battle him and he will give you a key to somewhere in the underground. When finding the real director, he will give you a card key.
After getting the BASEMENT KEY from the one rocket in the radio tower,go to the underground tunnel and from there,rescue the director.he will give you a CARD KEY which will open the door on the 3rd floor at the radio tower.
With the key card that you get from the director in team rocket's underground hideout. You get the to the underground hideout from beating the fake director at the top of the radio tower. Talbotron X
On the fifth floor. Battle the rocket to the very right. He will give you the card.
To get the card key in Pokémon Fire Red you need to go the 5th floor in the Silph Company. You will find the card key after defeating the Team Rocket members.
A team rocket member has it. You need to beat them to get it.
The card key in Pokemon Heartgold and Soulsilver is located in the Goldenrod Underground.
You have to defeat a certain Team Rocket Agent and he'll drop the Card Key.
They're in the Underground, in the lower part that branches off. You go through the door that used to be locked. but first you have to defeat ever sngle team rocket grunt to get card key to open door
you get the card key for the radio tower in goldenrod by saving the director from the underground basement. Talk to him and he should give it to you.
The Card Key is located on the Fifth floor in Silph Co. Clear at the bottom by a Rocket Grunt.