Use fly or flash in the middle or do a lap around the cave.
get all 3 regis and go the and the last regi will fight you
It is the dots, on the north face of the cave.
learn the braille alphabet and do what the writing on the wall in regices cave says. take many great balls, ultra balls, and timer balls
There are 3 caves but to get into these caves you have to do a series of things you should probably find a guide before you do this because its very hard 2 explain, try serebii.net
start by opening them near pacifidlog. then regice is opened by clicking on the writing. press a, then b, then wait for about 2 minutes without moving. the cave door should collapse and go catch regice
serebii.net gamefaqs.com
Read the braille, then don't touch the game for about 2 minutes. This will open the door to Regice.
Go to this link for all you need to know and its a great site for all Pokemon info and its not some stupid website its really good http://www.psypokes.com/emerald/legendaries.php
It says: "stay close to the wall, run around one lap" Which means run a lap around the cave without bumping or hitting the wall.
Regices cave is at route 105 (north of dewford.) You have to click on the patterns on the wall then wait about 10 mins. The next cave (which is regirocks) is at route 111 (north of mauville city.) You have to go right down the bottom of the desert. For this one you click on the pattern on the wall then go right, right, down, down then use strength. Then the door will open. The last cave is regirocks cave. You have to route 120 which is in between fortree city and lilycove city. For this one you click on the pattern on the wall then go to the middle of the cave and use fly then the door will open.
You have to find him in a cave, id say the elite four cave
'Douketsu.'