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Trade with Pokemon Platinum, Pearl, or Diamond.
Trade the event Regigigas to Pokemon Platinum then get the national pokedex and it will unlock certain events in the game.
You cannot get Regigigas in Pokémon SoulSilver, you will have to trade it from Diamond, Pearl or Platinum.
You cannot get Regigigas for Pokemon Ruby since it is a newer generation of Pokemon. It is for Pokemon Diamond, Pearl and Platinum
I am sorry it's impossible to get Regigigas in Pokemon Emerald. You can only get it in Pokemon Diamond, Pearl or Platinum.