Yes, yes, yes! Finally! After running around all of Spira twice, doublechecking all the locations I finally found the one I missed. It was at Mt. Gagazet - very difficult to see. Actually, I didn't even see it, I just clicked randomly at every dead-end and to my surprise - there it was!

Now I got Auron's Tornado and is one step closer to my Perfect Game (or maybe I should call it Completed Game!