Regice will appear in the Island Cave on the bottom floor after you solve the Sealed Chamber Mystery.
You can only get regi ice in sapphire,ruby,and emerald.
Kyogre and latias. regi-rock, regi-ice, regi-steel
migrate it from ruby, sapphire, or emerald
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Sorry but you can't get them on Pokemon Platinum. You have to migrate regi rock regi steel and regi ice from eiter ruby or sapphire, ( idk about emerald) i hope i helped ;)
route 207
In the snowpoint temple you need the 3 regi's from ruby,sapphire and emerald to wake up regigigas.
DotBraille is Regi's language in Ruby, Sapphire and Emerald. By reading them in the walls and de-coding them, you can find Regi's (expect Regigas!).
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 ^.^
No. You'll need to trade it from Pokemon Platinum or migrate it from Pokemon Ruby, Sapphire, or Emerald.
you don't you must trade from Emerald, Sapphire or Ruby.
You can't get a Regigigas in Sapphire, Ruby or Emerald. Regigigas is a Generation IV Pokemon, and Sapphire, Ruby and Emerald are Generation III games.