You defeat team R grunts till you get it
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 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 director of the radio tower will give you the card key after you have defeated lambda in the tower he will give you a key so you can open the basement of the goldenrod tunnel. There you must search for the director and he will give you the key
Once you found the real director of the radio tower he will give it to you.
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.
go in the radio tower, right as soon as you walk in their are 3 people in the counter, talk to the third one and answer the questions correctly to get it
You must defeat Team Rocket in the Radio Tower. Petrel (the guy who is pretending to be Giovanni) will give you a "Basement key", which is the card key.you get the card key in the bottom floor of the department store in Goldernrod City
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
i think opens some doors in the radio tower or in the undergroun area in goldenrod city
The EXPN card is on the first floor of the radio tower in Goldenrod city.
In the radio tower after you answer a quiz
u get it from the person in the radio-tower