To unlock the Pokeflute channel, you have to restore the power plant (Get it working) and go to lavender town radio tower and speak to the brown hatted man and he gives you the radio card and go to the top star (Very top) and its the PokeFlute channel.
once you have saved the power plant and beat misty the gym leader go to lavender town and go inside the radio station talk to an old man and he will upgrade you radio
Go to Kanto's Radio Station and talk to the Gentleman in there, He'll tell you about something and now you can move the circle in your Pokegear radio to the top and find the pokeflute.
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you dont get the pokeflute you use the pokegears radio once you can in kanto and tune it to the pokeflute channel
The pokeflute doesn't exist in your radio you can tune into a pokeflute channel.
use the pokeflute but if ur in heartgold or soulsilver, move the dot on ur radio to the top of the circle (pokeflute channel)
Go to the lavender town radio tower and talk to the old man inside
You dont, you go to the radio tower in kanto and get the pokeflute sound on ur radio