The boulder puzzle can be found in Sevault Canyon on Quest Island. The puzzle itself is inside a chamber called Tanoby Key. Tanoby Key is found in a cave near the north of the Canyon.
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Once you finish the boulder puzzle in the cave called Tanoby Key on Seven Island enter the Tanoby Chambers and walk around eventually a Wild Unown will appear.
to move the boulder u have to have a chisel and hammer
Once you have finished the boulder puzzle in Tanoby Key which is a cave located on Seven Island you can find the pokemon Unown inside the Tanoby Chambers just walk around for a bit and you will find one.
the sleeping Pokemon is unknown. you get it by doing the boulder puzzle in sevault canyon.
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!