To get regice, you need to either get it from ruby/sappire/emerald, or you can catch it if you have gotten the level 100 regigigas from the event before the release of platinum.
Yes First, you need to have a Regirock/Registeel/Regice in your party.
They are on route 79,56, and 54. But you need some sort of item to get into the cave of regice.
you need action replay to get regice,regirock,registeel and regigigas
no
you need REGIROCK, REGICE, AND REGISTEEL.
you need a action replay
you need regice registeel and regirock then go to the snowpoint temple
You need a Relicanth and a Wailord.
You need Regice, Regirock, and Registeel.
you need to have two master balls.
you need to trade or migrate.
You need to have Regice, Regirock and Registeel in your team.