you get it in lavender town
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Go to the radio tower in lavender town then talk to the man in the hat and he will give you the expn card
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.
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 automatically attaches to your radio now you can tune into kanto radio!
you have to finish the power plant problem then go to the radio tower in lavander town and talk to the man in the hat and he will give you the exp. card