I've found this Video at the Youtube. I don't know who did it, but it is amazing!!!
Rinoa and Diablos VS Cerberus.
This is a video cut, because, as I recall, Apocalipse was Adel's or Ultimecia's Limit Break, not Diablos's and the GF doesn't stays with the party member who called it,it's just coming throws the Limit Brake-in this case Gravija-, and then dismisses, but here the the guy/girl who made the video, kept Him in battle :) :) :) And on top of that, The Black Mages's music ( Mr. Uematsu's band--music composer of the FF series) can be hear along the video! I like it sooo much!!!
Enjoy :)
http://www.youtube.com/watch?v=MNjeqI2gnh0&feature=related
-Scary Friend in HQ from some kind of Forum, I've found :) (just open it, it is a large image!!!)