This sound is from Snorlax Soundboard

Snorlax is voiced by Katsuyuki Konishi in the Japanese versions of the Pokémon anime and the Super Smash Bros. series of video games.
See also: Pikachu, List of generation I Pokémon, Pokémon Jet, Celestial (Ed Sheeran song), List of generation VIII Pokémon, and Pokémon XD: Gale of Darkness.