You cant you can either use action replay which I recommend as you can get every Pokemon possible, or trade them over from a previous game.
All 3 of the Regis are level 40.
You can't get Thunderus in Pokemon Platinum at all. By then when Pokemon Platinum was made, no one knew that Pokemon Black and White were going to be made.
You cant catch it im pearl. You can only migrate it or trade for it. Once you get all the regis and beat the elite 4 you can get regigigas in the building in the back of snowpoint city
There isn't a Pokemon named Regiearth. All the Regis are: Regice, Regirock, Registeel, and Regigigas
you can't get the three regis but, if you have pokemon sapir\rubi\emerald version on the gameboy advance, you can tke the three regis through the pal park in route 221 (in south). *there are three caves that may be the caves of the three regis but i don't know what to do there.
Catch them all.
not. you will have to migrate them from emerald
No. You have to trade from another game.
all i know is how to get the regis and latios or latias.
You can not catch any of them in black or white, but I think that you can catch all 3 in diamond.
well, when you catch all of the regis in either Pokemon ruby, Sapphire, or emerald put them in Pokemon diamond or pearl using pal park and you will be able to find regigigas
First get all other 266 Pokemon in the Browser then you will get a mission to go to hippodon temple. Catch the 3 Regis then go down a hole in the temple put the three regis on these things then you vs Regigigas
Actually you're wrong you can NOT get the regis in Pokemon diamond, to get the regis you need Pokemon ruby/Sapphire/emerald you can get all three regis there(regi ice, regi steel, regi rock) althought if you migrate all of the regis onto Pokemon diamond you can get regi gigas(king regi) you will find him in the snowpoint temple after beating the elite four. Thanks hope i helped ^.^
catch them all
All 3 must be traded from either ruby, sapphire or emerald.
There really isn't one that's completeley strong, but you can catch an ice Pokemon that starts off strong: Regice. Try completing the "Regis" puzzle to catch all 3 regis.
you go to pal park and download them into platinum, diamond, or pearel.