snorlax cant learn blizzard just by levelling up, but u could probably teach it the tm of it. if it helps, u can buy the tm in the department store in goldenrod.
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Snorlax, and a few other ones...
Imran: Yes Snorlax can learn giga impact. When I caught the Snorlax Lvl50 that was sleeping in front of Digletts Cave it knew Giga Impact in Pokemon Heartgold and Soul Silver. I do not know about other pokemon games in which you can catch Snorlax that they would know Giga Impact or not. But of course you can teach Snorlax Giga Impact with a TM. So, yes Snorlax can learn Giga Impact.
Yawn is not taught by a move tutor it can be learned by some Pokemon such as Snorlax also Slakoth and Slaking.
He dosent learn it.for info on Pokemon moves it learns by level up or Tm and Hm.go to serebii.net
Snorlax Can Learn Surf - Strength - Whirlpool - Rock Smash and Rock Climb