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Trade with Pokemon Platinum, Pearl, or Diamond.
You cannot get Regigigas in Pokémon SoulSilver, you will have to trade it from Diamond, Pearl or Platinum.
You cannot catch any of the Regis (Regirock, Regice, Registeel and Regigigas) in Pokémon HeartGold or SoulSilver.
Regigigas is a Sinnoh pokemon. Not a Hoenn.
Regigigas is a pure Normal-type Pokemon.