You can et it at Lavender Town Kanto if you have beaten the Power Plant issue i believe have not played it in months.
In lavender town in the radio tower. Poke Flute is on the top of the radio
go to the power plant, talk to the manager guy then leave. when you are leaving talk to the police and he will say something about a shady character around the cerulean gym. go to the gym and talk to the team rocket member then go the the bridge and you will battle him. after you beat him he will say that he hid the missing part in an inner tube. go get it and return it to the manager guy. after that the power plant will be on, go to the radio tower and the owner will give you the expn card.
In Kanto, go to lavender town and, instead of the pokemon tower from generation I,there is a radio tower.Go in there and find out the rest for yourself.
You can get it at the lavender radio station after restoring the power to Kanto.
To get the EXPN Card, go to the Lavender Town Radio Tower. Talk to an Old Man near the north wall and he will give you the EXPN Card.
You get it from a guy in the Lavender Town Radio Tower after you solve the Power Plant problem.
you have to find the missing piece from the power plant and then you go to the radio tower and talk to everybody one guy will tell you that you saved his job and he'll install the EXPN card
The EXPN card is on the first floor of the radio tower in Goldenrod city.
SOulsilver
You have to fix the power plant and then go to Lavender town radio tower.
The PokeFlute is not a tangible item as it was in Pokemon Red, Blue, and Yellow. The PokeFlute is a channel on the Radio, which is the top tiny star after obtaining the EXPN Card from a man in the Lavender City Kanto Radio Tower.
A Pokemon from a Diamond, Pearl, Platinum, Heartgold, or Soulsilver event.
The expn card automatically attaches to your radio now you can tune into kanto radio!
pokegear app ONLY IF HAS GOTTEN EXPN CARD
After you get the EXPN card he is right next to the Power Plant.
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.
i realy dont know. i have been looking for it my self
You go on the Pokegear and go all the way to the top of the radio and that's the EXPN card (EXPN card is the poke flute)
The EXPN card is on the first floor of the radio tower in Goldenrod city.
Go to the radio tower in lavender town then talk to the man in the hat and he will give you the expn card
To get the PokeFlute, you must have the expn. card. To get the expn. card, you have to talk to the guy in the Kanto Radio Tower in Lavender Town. The top center tiny star is the PokeFlute channel.
you go to lavender town and go to the radio tower and talk to everone there and someone will give you the card you need
talk to guy in radio tower
lavender town radio tower