In normal gameplay of Pokemon Diamond and Pearl, Regirock, Registeel, and Regice cannot be caught in the wild. You will need to send them to Diamond or Pearl by inserting Pokemon Ruby, Sapphire, or Emerald with the Regi Trio in your PC and transfer them to the Pal Park.
You can only get regi ice in sapphire,ruby,and emerald.
You need to trade for them.
You have to trade them from older versions of Pokemon.
by getting all three regi`s from Pokemon emerald, then you can go in and find the fourth regi. (Regigigas)
Actually you're wrong you can NOT get the regis in Pokemon diamond, to get the regis you need Pokemon ruby/Sapphire/emerald you can get all three regis there(regi ice, regi steel, regi rock) althought if you migrate all of the regis onto Pokemon diamond you can get regi gigas(king regi) you will find him in the snowpoint temple after beating the elite four. Thanks hope i helped ^.^
I think you can only import them from other versions.
You can't get the Regi's in Pokemon Diamond And Pearl. You have to trade from Pokemon Ruby, Sapphire, and Emerald.
No, but another Regi exists in this game. Also in the game that is coming out (Pokemon Platinum) Regigas has a new form.
Of Course
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 only know Regi rock,regi ice,regi stell and raquaza
you have to have gotten the other regi's unlocked first