You cannot get Regigigas in Pokémon SoulSilver, you will have to trade it from Diamond, Pearl or Platinum.
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it's not. buy diamond pearl or platinum.
Trade with Pokemon Platinum, Pearl, or Diamond.
You cannot catch any of the Regis (Regirock, Regice, Registeel and Regigigas) in Pokémon HeartGold or SoulSilver.
you press a you press a regigigas is unobtainable in emerald, only in Diamond and Pearlu Can'tIt doesn't exist in generation 3.you cant, regigias is only available on the pokedex in diamond, pearl, platinum, heartgold and soulsilver.
Regigigas is a Sinnoh pokemon. Not a Hoenn.