I've recently started a new game, but here's what my plan is next time I see him.

The Guide says 2 Dark Knights, and an Alchemist, so who'm I to argue. However, I'd have the Alchemist as a White Mage to start off. Cast Reflect, and move on to Alchemist, and Mix up a Chocobo Wing (Choco Feather and Potion), and a Hi-Wall (Any two Curtains. I prefer Light and Star. If anyone knows a better combo, I'm open for suggestions). Then, RATHER THAN STASH, THE GUIDE SAYS TO MIX A MEGA POTION, AS IT HAS A MUCH LESS RECHARGE TIME. Now anyone who wants to take this as gospel, IT IS JUST A THEORY! I'll update on whether or not it works.