You must Migrate from Sapphire, Ruby or Emrald.
you cant in platinum but you could trade from Diamond and Pearl or another Platinum.
No you cannot get the regis nor any hoenn Pokemon all must be traded to you from ruby, sapphire and emerald.
Yes, you do need all 3 Regis (Regice, Regirock and Registeel) in order to awaken Regigigas in the Snowpoint Temple. They must be with you when you awaken Regigigas.but then again it says you need regigigas to awaken the three regis.so you need to get the three regis from a gameboy advance Pokemon game.
You need relicanth and wailord to catch the regis in sapphire/ruby/emerald. You cannot catch the three regis in platinum unless you have the event Regigigas (this event has now ended). If you have the special regigigas in your party, three new caves will open up in Sinnoh and you will be able to catch the three regis.
trade them
Trade someone with Ruby,Sapphire,and Emerald.
You must Migrate from Sapphire, Ruby or Emrald.
you can't catch any of the three regis on any DS game except platnium.sorry:(
I think you have to transfer the three regis from platinum version to pearl version but you have to have platinum version I think that's all I know
It is only possible by cheating.Not by regular gameplay.
either you get Pokemon emerald or Sapphire, and if you want them on diamond or pearl you have to beat the elite four and then migrate.
you cant get the three regi's in heart gold or soul silver. You can only get them in Pearl, Diamond and Platnium
On Pokemon platinum, diamond, and pearl you have to get regirock, registeel, and regiice then you go to the snowpoint temple and go to the end and regigigass will be there talk to him and he will battle you.(you HAVE TO have the three regis- with you. on all the other ones you cant but you can get the three regi. forgot to get the three regis n platinum and diamond and pearl you have to migrate them. Hoped this helps!
Nothing special, but if you migrate them over to Diamond, Pearl, or Platinum, when they are at the same level, you can get Regigigas.
you first have to have the national pokedex and must have one of these games, Pokemon emerald, Pokemon ruby, or Pokemon sapphireRegircok, Regice, and Registeel are not findable in the wild in Pearl. You must port them over from Ruby, Sapphire, or Emerald.
I'm pretty sure you can't get them in the wild; you have to transfer them from R/S/E. Or trade them, but that requires the Pokedex data on them.