I fought these today. I think I just mimed bahamut a time or two 8) or maybe a third level elemental spell !X-cast on all three of them.

I've gained about four levels since I started world three, and everyone except lenna is level 44.

Seriously, go get bahamut, reflect his megaflare with carbuncle, and you'll be set get gogo for good measure. You might be well off to go the last lithograph; I did that xD

Also, if you get Gogo, you can work on mastering mime(phoenix tower magic pots beg for miming elixirs:]) and you'll get the innate abilities from your mastered classes; it's nice to have bartz or faris jump in front of someone I just revived:]