its a Pokemon that you find in the snowpoint city temple but to awaken it you need Regirock, Registeel, Regice.
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You could only get the movie Regigigas through special Nintendo events or through hacking the event Pokémon or by trading with someone else in order to get it.
Yes, you do need the special movie-event Regigigas or the ones that were distributed across the US in various Toys 'R' Us stores over the Summer of 2009 in order to have a chance to capture Regirock, Regice and Registeel within Platinum.
Regigigas is a Sinnoh pokemon. Not a Hoenn.
Regigigas is a pure Normal-type Pokemon.
You cannot get Regigigas in Pokémon SoulSilver, you will have to trade it from Diamond, Pearl or Platinum.