You need to know the move dive and get something from underwater
You can find the sapphire in the dotted hole cave on six island to find the cave go to the southern portion of the island, use Cut on the door to open it then fall down the hole in the cave then fall down the holes in this sequence: up, left, right, down.
you get the sapphire stone in the 6th island you have to open the cave somehow and you get a lugia if you go to the very bottom use cut on the cave
go inside walk for one lap and a cave will open go inside and you will see regice if you want to battle or catch him just walk in front of him and press a
It is located in Mt. Ember on Island One after you beat the Pokemon league. The cave that the rockets were blocking before is open for exploration after talking to Celio about the ruby and sapphire. After you get both, you can trade Pokemon Firered and Leafgreen to Ruby,Sapphire,Emerald,Colossuem and XD.
Read the braille then do the following: Step right twice then step down twice then use rock smash the door should open.
You have to get the the National Dex (beat the Elite Four) before you can go into the Fossil Maniac's cave.
Beat the elite 4 and give the ruby and sapphire to the guy on island 1
I don't think you can, in emerald you need the nationaldex and POW! it's open but in ruby and sapphire you can't.
The braille inside the cave says this: Run around the room. Stay close to the walls. Good Luck.
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.
You need to have obtained the ruby, national dex and all the HM's and have saved lorelei in four islands icefall cave and go to dotted hole on six island with a Pokemon that knows cut cause you must use cut on the door to open it.
It is on 6 island u use cut to open it inside is a sapphire.