You have to trade them from older versions of Pokemon.
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 ^.^
by getting all three regi`s from Pokemon emerald, then you can go in and find the fourth regi. (Regigigas)
You can only get regi ice in sapphire,ruby,and emerald.
There are four Regi pokemon. They are Regirock, Regice, Registeel, and Regigigas.
You need to trade for them.
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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.
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.
route 207
you can't catch regice in Pokemon diamond, however, with the use of all the regi's traded over you can take them to the temple in snow point city and awaken regigigas