You have to migrate ALL THE REGIS from Emeraled, Ruby ,or Saphire
There is no Pokemon named regigas. so there is no code.
You must bring forth to the statue Regice, Regirock and Registeel. To get them you need Pokemon Ruby, Sapphire or Emerald for the GBA and insert it in the GBA Slots on your DS or DS Lite. Transfer the three Pokemon onto Diamond, Pearl, Platinum and have them in your party. Then go to the statue and Regigigas will awaken.
mewtwo has to be with you
You can get it at the snowpoint city temple at the bottom of the temple.
when you get to the bottom of the snowpoint temple, there is a statue that reads: Pokemon of steel Pokemon of rock Pokemon of ice To awaken Regigas, the leader of the Regis that was said to pull the continents together, you have to collect Regirock, Regice, and Registeel. Make sure they are in your party when you visit the temple so you can awaken it. Regigas is at lvl 70, so try not to make it faint. Good luck.
you don't need regigigas for registeel. you need reegisteel, regirock and regice for regigigas on Pokemon pearl or diamond
The legendary Pokemon are: Dialga, Giratina, Rotom, Cresselia, Uxie, Mesprite, Azelf, and Regigas.
migrate regirock, regice, registeel, and then you can access the regigas (migrate from emerald, ruby, or sapphire)
you can't.. make sure you have the three regi's and migrate them to Pokemon diamond/ pearl. You need National Dex. Now enter the Snowtemple in Snowpoint City. Regigas will be waiting if you bring the 3 Regi's.
i am not sure but you should trade with someone who has ruby sapphire and emerald. One PKMN from each of those games you need to get Regigas i think
By redigas, do you mean Regigas? And no Regigas is a legendary. No Pokemon evolves into it.
It's spelt different (i think like regigigias) and nothing special happens after, but you've got a strong Pokemon!