hmm-
doesn't a black hole allow Quistis to learn Degenerator (good limit break, but not Shockwave Pulser)
I'm only saying b/c I'm trying to get it too and I think you have to collect 100 cursed spikes (or sharp? pretty sure it's cursed) and use Siren's Refine ability to refine into a Dark Matter, which wil give you Shockwave Pulser. Anyone know for sure?