Ok, after you battle the T-Rex with Quistis, go towards the entrance of the Training Center, just before you get there you will hear a scream. When you go to check it out, the girl who screamed(Ellone a.k.a "Sis" to Squall), ask for your help, the monster will turn around and fly towards you, then you will be trusted into battle. Ok, here's my line up for you. This boss isn't that tought o deafeat. Simply K.O. the Granaldo, and the other mosters that it has with it will sit there and wait helplessly for the Granaldo to pick them up. Nothing to draw here either. Enjoy.
