You cant (sorry) except for regiggigas - or something like that, but to get to him you need to have the others from ruby sapphire or emerald.
trade from platinum or with someone that have the regis from mirgating or mirgate self.
you cant get them unless you migrated or you usec the toys r us event
I'm fairly certain that you have to trade them from emerald, diamond, pearl, or platinum.
You go to the snowpoint temple but first you need to have the national pokedex and regirock regice and registell.
The reggis are not available in leafgreen you will need Ruby, Sapphire and Emerald to give you them.
Well to get the Regis you have to have a gameboy game in the gameboy slot of your ds then migrate 6 or more of the then go to pal park near sandgem you need to beat the elite 4.
i now how to get two first go to iron island then catch the other two then go to snow point city and Reggis are there
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its the other way around and you migrate the regi's. you can but in Pokemon platinum only. regice is in northern part of mount cornet. registeel is in iron island. rgirock is in route 228. PS. you need to have regigigas from event first.
if ya talking about the regi Pokemon you haf to trade from ruby/sapphire/emerald. DISHO never herd of reggis
I don't think you can!
Lvl 40 I believe.