Have an Alchemist and two Dark Knights, every turn you get with the Alchemist, use mix to make a mega-potion, even if you don't think you need it, and make the dark knights use darkness.
If you have Ragnarok, then equip it to a Dark Knight and keep using Black Sky.

If you don't mind doing it a cheap-o way, get a songstress that knows Jitterbug, two gunners, and a turbo controller.
Haste+Trigger Happy+Turbo Controller=Awesome