After defeating Team Rocket in Lavender Town Pokemon Tower, you will be taken to Mr. Fuji's house. There he will give you the poke Flute, which can be played to wake Snorlax up. When awoken it will battle you; be prepared, Snorlax is a powerful pokemon and you don't want to miss your chance to catch it.
From there it's a simple matter of catching or defeating Snorlax to move past him in the game.
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He is the sleeping pokemon blocking the entrance to cycling road and past vermillion city
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Unfortunately there are no wild Snorlax in Pokemon Ruby, Sapphire, or Emerald. The Snorlax must be traded from Firered or Leafgreen, or gained using a gameshark.
Lavender town is in Pokemon red, blue, yellow, firered leafgreen. NOT GOLD. also the tower in LAVENDER IS POKEMON TOWER. Defeat it to get pokeflute to get past snorlax
Get the flute