you must import Regirock Registeel and Regice from gba games (sapphire ruby emerald firered or leafgreen) but iff u had the 100 regigigas from the event you could get them in the iron island area...
Well other than cool you off on a hot day and take swelling down on surface injuries not much other than to make adult beverages a bit more enjoyable. Great with cool aid too.
Their names are: Body of Rock- Regirock Body of Steel- Registeel Body of Ice- Regice They're also called the "Three Regis". If you transfer those Pokemon from Emerald or other GameBoy Pokemon...