I used Terra (no 35 CP), Lenna (35 CP, 0LB), WoL (same as Lenna). Both Terra and WoL were 57/60 at the time. Friend Terra obviously and Ifrit summon.
If you don't bring a healer you need ways to reduce damage because the boss will HP attack you and with no debuffs it'll deal over 3k making you fail the mission.