It evolves from Munchlax when leveled up with high friendship.
In the Generation I and II games and their remakes, Snorlax can be found sleeping in inconvenient locations throughout Kanto. To catch one, a Trainer must first awaken it with music from either a Poké Flute or Pokégear set to the Poké Flute channel. A sleeping Snorlax makes a return in Pokémon X and Y, in which it is blocking the player's way on Route 7."
That was a close one. Man. I'm getting too old for this. Don't tell the cops, okay? I need this money a lot more than you do. I've got health problems and orphans and other things I'm definitely not making up.
Also, don't ask me why my shirt and ski mask just changed color. I'm a mugger that lives in the Internet and mugs people for looking at Pokemon articles. What sort of consistency do you want from me?