TO get the regis migrate the one you want with 5 other Pokemon to diamond (get the regis in Pokemon R/S/E) and go to pal park Go catch them with GS like balls with a catch rate the same as a master ball O_O
Migrate from GBA games
Yes, you can trade for it or you can mirage it into the Pal Park from the GBA Pokemon games.
You can not catch any of them in black or white, but I think that you can catch all 3 in diamond.
There are three that are Ice, Steel and Rock. Ice- Reggieice Steel-Reggiesteel Rock- Reggierock King Reggie is Reggiegigas
ice/snow types
grass
The ice rock is found on route 216.
Ice type pokemon.
You can only get regi ice in sapphire,ruby,and emerald.
fire type
it depends on the pokemon.....example:i have a Pikachu its weekness is water,i have a Piplup is weekness is ice.....
in the ice temple in snowpoint sity