in the undergroud tunnel
you have to get the radio card in kanto then go to it and go to the top and it will be a radio station called pokeflute
you have to do just nothing at all
You go to the Underground area of Goldenrod and go to the door that was locked. Then you save the Director of the radio station.
AnswerThe Expn card can be obtained by going to the Lavender Town Radio Tower in Kanto. By talking to the Tower's Director, you will be given the card which allows you access to the Kanto radio stations.
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
Go to Laveder town and go to the radio station. Then talk to the director (the guy in brown).He should give you the Kanto radio card. Be sure you gave the missing machine part to a guy in the power plant.
Go into Goldenrod radio station, talk to the lady at the counter. The farthest from the door. Answer five questions and she will give you a radio card.
fix the problems in the kanto region get the power plant working and then go to lavender town radio station.
Get the Radio Card from the Radio Station.
You need to have: Restored the Power to the Magnet Train/Radio Station before you can gain the Radio Card. (You need to find the Rocket in Cerulean Gym, find the part, chase the Rocket down and take the part to the Powerstation (East of Cerulean/North of Lavender). The owner of the Radio Station in Lavender (it's where the Pokemon Tower formerly was) will give you the upgrade.
after finding the director you will end up in the department store but the director gives you the card key go back to the radio tower unlock the door on the third floor beat Ariana then go the elevator
Go to lavender town and go in the radio station. Then there is a man facing the wall so talk to him and he will give you the EXPN card.