After you have saved the electric power station, go to the radio tower in lavender city, and an old man runs over to you, and he gives you a radio card. All you have to do now is to get to route 11, and walk up to the Snorlax. You then need to go on your radio, and move the orb like thing up to the very top of the touch screen using your stylus. Then just interact with the Snorlax to battle it.
*Note* The Snorlax is level 50, and has a 55% chance of holding leftovers.
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There is no Poke Flute item in Pokemon Silver. Instead, the player can have their radio upgraded in Lavender Town. It will then play a station that can play the Poke Flute tune.
um i think you can wake it up use a station on the radio... (I'm not up to that bit yet)
The radio will be your instrument to wake up the sleeping Snorlax. There's a certain radio station that plays the poke flute. When you face Snorlax, tune in to that station and let the Snorlax hear the flute for it to wake up.
use your radio, flip through the stations, pokeflute is near the end, but is on the radio.
The only way to wake up Snorlax on Pokemon Silver is by using the Poke Flute on kanto radio