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
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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!
Go to the radio tower in lavender town then talk to the man in the hat and he will give you the expn card
what expn card<-----Why in the world did this person answer this and not know the answer? Anyway you just get it to be able to use the radio on the pokegear in Kanto.
you get it in lavender town