if you mean fire red, he is on the road to fushia city, both of them. he is asleep on the bridge that takes you from lavender town to fushia city and blocks the cycling road. use the pokeflute on him to battle him. he is on level 30 and is pretty hard to catch cuz he uses rest and is holding the chesto berry. he also knows snore so he can attack while he is asleep. i used the ultra ball on him when he is asleep and his hp is low.
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You can only get Snorlax by evolving Munchlax.
Snorlax is number 113 and is in your rivals party at the Pokemon League when you battle. The Pokemon after Snorlax is 114 and is called Unown and can be found in the Solaceon Ruins.
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.
Snorlax is found blocking diglett's cave in vermilion city.
i don't think it's in it but if it is Seribii.com is a good place to find out where