Simple answer: you can't, because Regigigas appears only in Generation IV (Diamond/Pearl/Platinum). However, in DPPt, if you get all three Regi's from Ruby and take them to Regigigas, it will awaken.
To get Regice/Regirock/Registeel, there is an underwater ruins on Route 131 (west of Pacifidlog City) that has specific requirements to enter. Once the requirements are met there, the three tombs will open and you can battle them.
You cannot get Regigigas for Pokemon Ruby since it is a newer generation of Pokemon. It is for Pokemon Diamond, Pearl and Platinum
To awaken Regigigas you need to migrate from Ruby/Sapphire/Emerald the three Regis.
Regigigas is a Sinnoh pokemon. Not a Hoenn.
Regigigas is a pure Normal-type Pokemon.
From what I have heard, Regigigas is a Hoenn pokemon. You will have to trade it from Platnium. Sorry!
Regigigas does not appear in Ruby. Regigigas is a fourth Generation Pokemon, and Ruby is a Third Generation Game.
You cannot get Regigigas for Pokemon Ruby since it is a newer generation of Pokemon. It is for Pokemon Diamond, Pearl and Platinum
regigigas is not a Pokemon you can obtain in ruby because regigigas was made in diamond and pearl and platinum so you can't get it in ruby ever.
no
You can't get regigigas in ruby.
No. Regigias is only available in in gen 4 and up. You can catch regigigas in Pokémon omega ruby and alpha sapphire
Regigigas is a Pokemon from Diamond/Pearl and Platinum so it is a newer generation of Pokemon. Therefore, you cannot get it
No, only in diamond and pearl
Regigigas is not in Pokemon ruby. you cannot get him in ruby without crazt hacks which might ruin your game. you can get regice registeel and regirock but ask some one else how to because i forget
regigigas is only avaible in Pokemon diamond, pearl or platinum
no and by the way it is regigigas not regy gigig
You can't get a Regigigas in Sapphire, Ruby or Emerald. Regigigas is a Generation IV Pokemon, and Sapphire, Ruby and Emerald are Generation III games.