The only way to get the 3 Regis in Pokemon Platinum Version is if you have the Regigigas given away at Toys 'R' Us. Only that exact Regigigas will activate the other 3.
\
actually Registeel is in the Iron Ruins inside of Iron Island B3F.
use dig in there caves
you cannot catch any regis in platinum you have to migrate them or trade for them but if you get regirock, regice, and registeel on platinum then you will be able to catch regigagas at level1 in the snow temple
Regigigas is Pokemon #486 on Pokemon Platinum. To get it, go to the Snowpoint Temple with Regirock, Registeel, and Regice.
no you need to have the three regies in your party to make regigigas appear
All Legendary Pokemon you can catch in Platinum: Giratina, Azelf, Mesprit, Uxie, Dialga, Palkia, Heatran, Regigigas, Cresselia, Darkrai, Articuno, Zapdos, Moltress, Regirock, Regice, Registeel, Shaymin, Arceus. (Darkrai, Shaymin, and Arceus can only be got by events).
If You Have The 12th Movie Regigigas In Your Party,Registeel Can Be Found At Iron Island.
beat elite 4
If you have Regice, Regirock, and Registeel.
regeggias in snowpoint temple with regirock regiice and registeel on platinum only
you have to have them traded from ruby Sapphire or emerald
you must have regirock, registeel, regiice
You can't. You can get it only through migrating, trading or cheating.
You need to have Regice, Regirock and Registeel in your team.
You have to have regice, regirock and registeel. Then go to the snowpoint temple.
Regice: mt coronet exit regirock:sand storm place registeel: iron island order: Regirock regice registeel
you need to have regirock, regice, and registeel
To get Registeel you would have gotten the level 100 Regegigas from a wirerless event or migrate it from saphire, ruby, or emerald.