Almost All Pokemons In The 3rd Or 2nd Forms Can Learn Giga Impact so Can Dragonite
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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.
Tauros, Aerodactyl, Snorlax, Donphan, Electivire, and Regigigas learn Giga Impact by leveling up.A lot more learn it by TM.
garchomp can naturaly learn giga impact, earthquake
Giga impact
You can't, giga impact is a Gen 4 move.