Quote Originally Posted by BG-57
Either I have rotten luck or the odds of Dragon Zombies casting Pandora's Box goes way down after the first time. I had one game where I didn't get Pandora's Box from the first one and went back and fought dozens of them and they never used it in the latter battles.

I eventually gave up and started a new game; the first Dragon Zombie I met promptly cast it before dying. So it may well be randomly cast, but the Dragon Zombies seem to behave differently after the first encounter At least in my experience.
I would have recommended fighting the Dragon Zombies you encounter on the "steps" before fighting Jenova SYNTHESIS, as they seem to use it more often. You have also have run into a glitch. It appears the game is full of them; something I hadn't known about until I came here.