9b11f552____Final_Fantasy_X_2_Item_List__Location
[Name] Gaol Sphere [Description] Found by Logos in the Bevelle underground. [Location] 
Obtained in Logos's room on a bookshelf in Leblanc's Chateau during Chapter 3 after viewing Logos and Ormi's Spheres.
Final Fantasy World - Final Fantasy X-2 Item List
Location