There's only one Snorlax in the game, and that is in front of the Diglett Cave. To wake it up, you'll need the Pokeflute playing as your radio channel.
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Breed a Snorlax
Snorlax is found blocking diglett's cave in vermilion city.
you'll need the poke flute
get the pokeflute app on your radio (in the kanto radio tower) and play it in front of the sleepy snorlax, then talk 2 him
You have to wake up the Snorlax in front of Diglett's cave and catch him. He is holding leftovers.