I think only garchomp can learn it but its a dumb move
Electivire can also learn it
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Garchomp cannot learn Giga Impact from leveling up in Pokemon Platinum. Garchomp can learn Giga Impact from the TM that teaches it which is TM68.
There is no major difference. But hyper beam works better is your pokemon has better special attack and giga impact works better for those with higher attack.
Sorry...it's at level 100... or by TM68
No, Munchlax is not capable of learning or being taught Giga Impact.
He can learn many but he can learn moves like giga impact and hyper beam when he evolves. So if you want good moves evolve him!