Summary: Team Chrono, Ayla, Marle. Boost Magic def as much as possible before right. When battle says "defense is down" attack the right-most pod. Otherwise, attack the left-most pod, then center enemy.
Ayla, Chrono, and Marle. Use Marle to pretty much use Haste and heal exclusively. The Chrono/Ayla double tech "Falcon Hit" and "Volt Bite" work well. Otherwise, use Chrono Spin-slash and Ayla Triple Kick.
EQUIPMENT: First, give Marle your best defensive armor, she will be your life line. Remember only one piece has to have status immunity to revive the buff but it will be overridden. Prioritize Marles Physical DEF as she has decent Mag Def. I would recommend Haste Helm, Prism Dress, and a silver stud(gold if you have 2). Ayla is the opposite, boost her Mag Def and she will be nearly indestructible. Give her the her Prism Helm, Prism Dress (charm Zeal Right hand in Omen before Lavos), Prism Specs (gold stud is good Alt) and she will brutalize the glorified spa