You can't. You can only fight each of the legendaries once, because there are only one of each. That means regice, registeel, regirock, groudon, etc.
there is not regice in pearl. but if you have ruby, emerald, or sapphire you could trade regice,regirock, and registeel to get rigigious.
you cant get regice in pearl you haft to migrate him from sappire ruby or emerald
You can find Regice out on Route 105 and you have to Surf West until you see a cave. Then once inside you read the inscription and it says, "Wait for time to pass twice" which means wait for 2 minuets and then it will open the door.
migrate it from ruby/sapphire.
Regice can not be caught in HeartGold or SoulSilver. It can however be caught in Platinum, Ruby/Sapphire, and Emerald.
The only way to get Regice on pokemon diamond is to transfer them from Ruby, Emerald, or Sapphire.
you can not get regigigas! but you can catch regice, regirock, registel.
Transfer from Ruby, Sapphire, or Emerald.
you have to migrate it from ruby sapphire or emerald
Regice is near Dewford town. If you surf to the North-West you will find a cave, that is where Regice lives.. If you still don't know it, search it on YouTube.
no... u can only get Regice in Ruby, Sapphire, and Emerald. Not Diamond, Pearl, or Platinum.
Regice is in route 105 in the island cave with those 5 big boulders around it.