You catch regice
anywhere
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.
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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.
You can get deoxys if you have enough team points and belong to team tppc and sorry you can't catch him the only way to get him is team points or buying him hope this helps^_^ and on Pokemon tppc i am Libra25 and my traner number is 1752088!!!!
There is no possible way to catch Regice in Black or White, unless you use PokeTransfer or Dream World.
You can find Magnemite on the Victory Path.
go to safari zone and catch 150 Pokemon then it will appear
you catch one
Yes.
Get the Regis then put them in your party with regice, registeel, and regirock. Then you go to Magic Mountain and look for it after a long period of time you will eventually find Regigigas