Stand in front of the door and use the HM move CUT. Then the door will budge and dissapear, thus enabling you to get in.
The sapphire is on Six Island. You need a Pokemon to use cut on the dotted door of the cave.
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.
the ruby is in the cave on mt. ember on one island. the sapphire is in dotted hole on six island.
ITs at the bottom of island six in a place called dotted hole
mix records with ruby, sapphire or emerald who have the regi's. and go north six island to Altering cave and they will be there.
The sapphire is located inside the cave called Dotted hole on Six Island but once you obtain it you must defeat a scientist in the rocket warehouse on Five Island to get it again.
The ruins are on Seven Island. You need to go to a cave with a boulder puzzle. You need to put the boulders in the right places so that the ruins can be accessed. When you have the boulders positioned, you will "hear" rumbling on the game and the ruins will be accessible, where you can catch Unowns. If you are talking about the Dotted Hole on Six Island, then the way to get in is using HM Cut on the door. The Sapphire is inside that cave!
do you mean the cave in which u obtain the sapphire? if u do, then u get the sapphire in dotted hole, which i think is on six island...it could possibly be on five island, but im preety sure it's six. (u can't get there unless u've beatten the elite 4, but since ur asking about it, im pretty sure u have.)
Go inside the dotted hole cave on six island inside you can find the sapphire it will be taken from you! Follow the robber to five island and go inside the rocket warehouse inside defeat the robber and you will get the sapphire.
dotted hole is on the south side of six island. (the sapphire is in there) a little extra info: dotted hole does have braille in it.
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.
Its a sapphire its located in a cave called dotted hole on six island but when you get it a scientist will steal it you must beat him at the rocket warehouse at five island to get it back.