Things You'll Need
Instructions
Exit the Power Plant after the workmen restore the power.
Fly to Lavender Town, south of the Power Plant.
Enter the Radio Station building on the north end of town. The staff are rejoicing that the power has returned.
Talk to the radio station director, the man with the brown hat. He'll give you a EXPN Card that adds radio channels to your Pokegear. Now you can listen to Kanto radio broadcasts.
Fly to Vermillion City and walk west from the city, along Route 11, back to the sleeping Snorlax.
Press the "Pokegear" button on your touchpad. Touch the "Radio Card" icon to listen to Kanto broadcasts.
Drag the station selector dot with your stylus to the top-center of the signal screen until it says "Poke Flute." The Snorlax wakes and a battle begins immediately. At the conclusion of the battle, the Snorlax is gone, leaving the route and cave entrance clear.