You need to get the special movie 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 ^.^
you can't sorry.i transfer my emer__ to get the regis you can do the same with ruby and spafire sorry bout spelling
well, when you catch all of the regis in either Pokemon ruby, Sapphire, or emerald put them in Pokemon diamond or pearl using pal park and you will be able to find regigigas
you can't get the three regis but, if you have pokemon sapir\rubi\emerald version on the gameboy advance, you can tke the three regis through the pal park in route 221 (in south). *there are three caves that may be the caves of the three regis but i don't know what to do there.
You can find the three Regis in chamber-like places.Regirock is in Desert Ruins,Regice is in Island Cave,Registeel is in Acient Tomb.Shadowfritsch4
you only can find him in snowpoint temple in snowpoint city but you must have all three regis. bring all three regis go up to him and press A and the three regis will awekening him. hes a level 1 so have a goodb time catching him.
u have to get all three regis and then go to the temple in snowpoint city
go to all three lakes and you shall find all three
You can't. There is only one regi in pokemon diamond and pearl, Regigigas. But you have to have the other three before getting him. To get the three regi's you have to find them in either Pokemon Ruby, Saphire, and/ or Emerald and transfer them to Pokemon Diamond/ Pearl.
You can find Pidey in a Pokemon Outbreak in Pokemon Diamond
in one of the three caves on map two
Regirock Beat the Pokemon league 10 times and go to orbough city mine there will be a new room go in and regirock will be there click on him and capture him Registeel Regice