It is not a legendary pokemon rather it's a rare pokemon and the pokemon is called Unown. To capture it you must first complete the puzzle in Tanoby Key a cave located somewhere in Sevault Canyon on Seven Island. The puzzle consists of various boulders you must push using Strength which you need to use to push the boulders onto the grey looking circles on the ground. Once you put each boulder on each hole text should appear saying something happened far away. Go south to the Tanoby Chambers and go inside any of them and walk around for a bit and eventually a wild Unown will appear.
The Tanoby Ruins is the area where the Tanoby Chambers are located which is the far southern portion of Seven Island.
Go into the tanoby chambers to catch the Pokemon unown.
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 is the area that contains the Tanoby Chambers this area is the southern most point of seven island.
Tanoby Ruins
Go to the Ruins at Pokemon fire red or leaf green. Just use ultra balls... The ruins east of the Day-Care place. It's called Tanoby Ruins
It opens all of the tanoby ruins, and now you can go to the tanoby ruins, and catch unowns, a VERY rare pokemon. But they are common. Try to get one of every letter.
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.
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.
in the tanoby ruins
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Answer:it unlocks the Unown in the Tanoby Ruins farther south.