First, you have to awaken them.
To awaken the three rare Regis, you must have a Wailord and Relicanth.
Put the Relicanth first and Wailord last.
Go to Pacifidlog and go to the left.
You will find a current. Go down to the bottom of the current.
Keep on going left. You will then find a place to dive.
(You can use dive once you beat the Mosdeep Gym.)
Dive down in the diving spot.You will find an underwater cavern.
Go to the dots and go up by using dive.
You will find a small cavern.
Go up to the end of the cave and use dig.
You will find more dots.
Press 'A' on the dots to read it.
When you are done, you will here three doors open.
You have finished the first task!
Now, to get Registeel, you got to Lilycove and go left.
You will find some stairs on route 120, next to a person.
Go up the stairs, and you will find a person behind one of the wallpaper.
Behind THAT will be a cave that has Registeel in it.
Go in the middle of the cave and use FLY.
The door at the end of the cave will be open.
You should have lots and lots of Ultra Balls.
You should have a Fire type like Camerupt level 40, because that is the level he is.
Save before you do it!
To get Regice is very simple because when you get to Petalburg you go left, then down the water and you will find some tress on sand. Go left then up from the trees, and you will find another cavern. Go to the end of the cavern and read the stuff like you did before.Wait for 2 to 3 minutes, and the door will open. Have Registeel with you and then fight Regice with Registeel.
To get Regirock you have to go to the desert and go to the very bottom and you will find the cavern. Go to the very front and then go right twice, then down twice, use STRENGTH and the the door will open. Have Registeel with you to capture him, and save before you do that!
Now, you are finished!
Migrate from Pokemon ruby emerald Sapphire
No you cannot get the regis nor any hoenn Pokemon all must be traded to you from ruby, sapphire and emerald.
Trade someone with Ruby,Sapphire,and Emerald.
You must Migrate from Sapphire, Ruby or Emrald.
For Pokemon ruby you can catch the three regis, rayquaza, groudon, and latios/latias. In sapphire you can catch the three regis, rayquaza, kyogre, and latios/latias. However, in emerald you can catch kyogre, groudon, rayquaza, the three regis, and latios/latias.
All 3 must be traded from either ruby, sapphire or emerald.
there are other secrets in pokemon ruby where you can find the four regis
look 4 regis!!!
u cant caught the regis in Pokemon pearl if you want the regis migrate it from sapphire,ruby or emerald
you can only catch them in Pokemon emerald, sapphire, or ruby
Chuck Norris
Latios, Groudon, and I think the three old Regis (this doesn't include Regigigas), I'm not sure about Jirachi...most likely Jirachi is in Ruby