Da-Chao Fire Cave
There's a small fire cave carved into the side of Da-Chao at Wutai. The Fires inside block anyone from reaching the end of the cave, but they can be put out with the right item. During the raid on Shinra's Underwater Reactor, Cloud can pick up the "Leviathan Scales" from a treasure chest on the dock. The scales hold Leviathan's power of water and will put out any flame they come in contact with. Use "Leviathan Scales" on each of the fires in the Da-Chao cave to find the Oritsuru Weapon for Yuffie and the "Steal as Well" Materia.