Two ways:
1. Use a game shark and catch it with a master ball.
2. Or use a false slash and put it at 1HP then keep using timer balls and Ultra balls.
Mr. Seidschlag
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.
you cant get regice in pearl you haft to migrate him from sappire ruby or emerald
sorry, you can't catch them, you have to migrate them from the GBA game Sapphire/Rubymigrate
You catch regice
you catch pikachu in the safari zone
TO CATCH REGICE IN PEARL,YOU HAVE TO MIGRATE REGICE,USE AN ACTION REPLY,OR WALK AROUND FOREVER TRING TO GET IT IN TALL GRASS.GO WITH MIGRATE.GOOD LUCK.
You can only catch it in Ruby, Sapphire or Emerald and migrate it over. If you get an event Regigigas on Pokemon Platinum you can catch Regice there.
There is no possible way to catch Regice in Black or White, unless you use PokeTransfer or Dream World.
You need the Good Rod.
You can't catch it, you have to pick Torchic as your first Pokemon and then evolve it twice. Hope I helped! :)
you catch one
Yes.