You first have to have Regice, Regirock, and Registeel in your party, who you can only battle if you have the Regigigas that you received from a Nintendo Event included in your party. You can find Regice at the Iceberg Ruins in Mount Coronet, Regirock in the Rock Peak Ruins on Route 228, and Registeel in the Iron Ruins in Iron Island. You can find Regigigas in Snowpoint Temple, and you can get into Snowpoint Temple by by defeating the Champion, Cynthia, for the first time.
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Regigigas is a Sinnoh pokemon. Not a Hoenn.
Regigigas is a pure Normal-type Pokemon.
Your Pokémon can become the chosen one if you have the Golem or if you have Regirock, Regice and Registeel. You then will need to fight and beat Regigigas.
You cannot get Regigigas in Pokémon SoulSilver, you will have to trade it from Diamond, Pearl or Platinum.
From what I have heard, Regigigas is a Hoenn pokemon. You will have to trade it from Platnium. Sorry!