You get it in the Snowpoint Temple.
You can get regigigas by either trading it from the event before the release of platinum, or migrate the regis from ruby/sapphire/emerald, then go to the cave in snowpoint city, and catch it while you have all 3 of the regis in your party.
You need the Event Regigias that was given away in March 2009 at Toys-R-Us. When you trade it to Platinum, Regice will be in the cave when you enter Mt. Coronet from Route 216.
a regi is there not sure wich one proabably regirock
Regice=Mt.Cornet outside Registeel=iron island end Regirock=survile area go right and there should be a slide and the cave is hiding under the sand storm you need the regigias event. if you don't have the regigias event you go to the cave there will be a item. when is the regigias event? Today is 4/5/11.
Yes!; But only if you have A Lv. 100 Regigias from Nentindo event. Regigias = Go to iron island = go to the LAST cave near exit = press all buttons = REGISTEEL
Unfortunately, Regirock cannot be found in the Sinnoh region. However, it can be received over a special event, or sent to the Pal Park using Pokemon Ruby, Sapphire, or Emerald. This applies to all of the Regis, excluding Regigias, which can be found in the cave north of Snowpoint City. Regigigas can only be awakened if the other three Regis are in your party when you encounter him.
there is no cave of time
The turn back cave in Pokemon Platinum is in Seodoff Spring near veilstone city
Hippopotas is located in the Ruin Maniac cave in Pokemon Platinum.
I think its Dark Cave, I have 2 platinum games.
It's impossible so you have to trade from the Diamond, Pearl or Platinum event.
you find them in the cave