Hi I have three questions to ask.. 1) where are the regi caves?

To open the regi caves you need to have two specifc Pokemon which are wailord and some acient fish I don't exactly remember his name he looks like a fish from animal crossing if you have played it, it's the celocanth.
You put the acient fish in front and the wailord in back (or mabey it's the other way around).
Go to the seeled chamber and go to the very back wall and use dig to unlock the second room. If you don't have dig go to fallaber town and talk to the kid in that house with that crazy brother.
When you unlock the second door go to the end and press the a button at the wall. If down correctly you should here some noise and the player will say "it sounded is if three doors opened from far away. These are the caves location.
Regice-surf down from petalburg town to route 105 or 106. Regirock-in the desert ruins at the bottom of the desert.
Registeel-by the see town were you last battle may. It is past the gates where this were profeser is, he is looking for some acient thing.
I cannot tell you the rest sorry.

1) Regice- to the left of route 105.
Regirock- In the southern end of the sandstorm region.
Registeel- The left of route 120.

2) and 3)- Surf toward the sothern edge of route 134 and Dive into the little patch. Follow the path and dive up again right in front of the brail sign. Follow the instructions on the brail and you will unlock the caves.

First, capture a Relicanth underwater on Route 124 or 126, and obtain a Wailord by fishing on Route 29 or evolving Wailmer at level 40. Next, go to Pacifidlog Town and head west. Go along the bottom of the current until you hit Route 134, then go across the sandbar that separates Routes 133 and 134. You'll see a diving area. Go down there, proceed until you find a white mound, and resurface in front of the mound's inscription.

In the Sealed Chamber, go to the inscription at back and use Dig. (You can get the TM28 from the little by in the front room of the Fossil Maniac's House. Trapinch learns Dig at level 41, Nincada learns it at level 45, and Diglett learns it at level 17.) Go into the next chamber, put Relicanth in the leading spot in your party and put Wailord in the final position, and read the inscription at back. A tremor should occur and three doors should be opening.

Regirock's cave is in the southern part of the Desert on Route 111 (go in, read the inscription, walk two steps right, walk two steps down, and then use Strength to get access to Regirock), Regice's cave is on an island on the western side of Route 105 (go in, read the inscription, and wait two minutes to get access to Regice), and Registeel's cave is on the western side of Route 120 (go in, use Fly in the centre of the room, and proceed to the next chamber to fight Registeel).

Ok first the way to get the rgi's is.go to route134 and you will see a chamber with six rocks around it go in there follow the path a writing will be written it says use dive .next ut in a cave go to the end of the wall and it writes use dig then when you use dig a cave will open go in After go to the end of the wall and it write's 'first comes wailord then comes relicanth' or the other way then get relicanth and wailord after put them in order then go to the writing and select on it it will say 3 doors have opened from far away now go to route 105,111,120 and go to the end of the wall and try to figure the brallie alphabet then another cave will open then battle 1 of the regi