I finally created and honed Comet because of you guys, I'm surprised I didn't do so before.
What is the general strategy for the Aerith boss rush?
Intimidate will help tremendously.
For Lost Number, you can keep your Intimidate charges: he only has 60k HP, you can safely burst him, he doesn't hit that hard either (if you want to play it safe, use Power/Magic Break).
Materia Keeper is a little more annoying. Same advice as above.
For JENOVA, bring Slowga, keep her under Power/Magic Break, and burst.
For Red Dragon, use all your remaining Intimidate charges. Otherwise, don't hesitate to use Slowga. Power/Magic Break as usual.
For Demon Wall, you really want to blind it. Use Slowga right off the bat, and try to inflict Blind. Use your RW of your choice (Sephiroth's Shadow Flare can be used to Blind him; otherwise, take something like Lunatic Highand/or Sentinel Grimoire; Advancetaliate also works). Be sure to Power Break it. Burst it.