Move each boulder onto the holes in the cave.
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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.
The tanoby ruins consists of many different chambers inside you can find and capture the pokemon Unown but only after solving the boulder puzzle in Tanoby Key which is a cave not to far from the ruins.
The Tanoby Ruins at the southern part of Seven Island will become infested by the Pokemon Unown.
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 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.