Brail
The brail in the chamber to open the three Regi's starting from the top of the room down says:
First comes relicanth lasts comes wailord
In this cave we have living...
We owe all to the pokemon...
But, we sealed the Pokemon away...
We feared it...
Those with courage, those with hope...
Open a door. An eternal Pokemon waits.
The first room is just the brail alphabet.
The Regi caves say:
Registeel- In the center you shall soar above the rest (use Fly in the middle of the room).
Regirock- Three steps down, two to the right to find the strength you need(or something like that)(3 down, 2 to the right and use strength).
Regice- Be Patient and the door you seek will appear.(go to the back wall press A and just WAIT, seriously don't do a thing. Just press A once and WAIT).
More tricks, tips and cheats for this game are right here - Pokemon Ruby cheats
Comments for this hint