You can find the Unowns in there. So yeah, go catch them.
Answer:It unlocks the Unown in the Tanoby Ruins farther south.
The Tanoby Ruins is the area that contains the Tanoby Chambers this area is the southern most point of seven island.
The Tanoby ruins contain the Unknown Pokemon once the Tanoby key puzzle is solved. The Unknown Pokemon form the letters of the alphabet.
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 is the area where the Tanoby Chambers are located which is the far southern portion of Seven Island.
Tanoby Ruins
Tanoby Ruins is the main location for catching Unown in Pokemon LeafGreen. To get the Unown to appear in the ruins you need to complete the Tanoby Key puzzle.
Answer:it unlocks the Unown in the Tanoby Ruins farther south.
The Tanoby Ruins is a very special place. You can catch Unown there! But, in order to make Unown apear there, you must unlock them. To do this, go to Sevault Canyon on Seven Ilsand. Find the Tanoby Key there, and solve the rock puzzle with the HM Strength. Once you do, there will be a small earthquake. Now, go to the Tanoby Ruins, choose a ruin, and Unown will apear like wild Pokemon! And the best part is, you can have as many as you want!
nothing
Seven Island, Unknown live there
in the tanoby ruins