you open them by teaching a pokemon secret power and then tap A next to the indent.
rock is in the desert ice is on an island between mr brineys and dewford steel is between lilycove and forttree you have to open the caves 1st though
the dots on the walls are braille so search on web to learn it
In Pokemon Ruby/Sapphire you go in middle of the cave and use fly. You can only enter the cave itself after opening the 3 caves from the secret room near Pacifidlog town.
Forever
well they are secret bases but you need to teach one of ur Pokemon secret power(tm43), and u can get it in slateport city at the open market!(In Pokemon Sapphire).
You will need to use dig make a hole to enter the next room. The second room says Relicanth first and Wailord last in your party. When that happens, the regi caves will be open.
Pal Park (open after you beat the main game)
beat the second gym leader. hope this helped! : )
That's what the designers wanted.
The elite four will open and they will be stronger and you can now trade with ruby, sapphire and emerald.
read sign, wait two minutes the door will open
You need to know the move dive and get something from underwater