its been forever since i played 1-5, so im gonna leave those out

6- all 4 kefka battles, doom, and doom gaze
7- all 3 weapons
8- all guardian force bosses
9- ozma, quale, tantarian, and hades
X- penenance, dark aeons (all of them), nemesis, omega, and ultima. i actually beat ultima, and then went back and bribed him.