Here's what i did, it works on almost anything: Have your GFs learn all of the refining abilities they can, refine any magic you may find useful.

Junction wisely

If you have ultimas make sure they're junctioned to elemental defense.

Have levethian learn recover to use on rinoa and your party.

cast shell protect regen ect. on rinoa

Have Zell, Squall, quistis/irvine in your party.

Try to make everyone immune to earth attacks to avoid being hurt by quake.

have as many auras as possible. cast triple (or better yet use cerberus) on whoever has aura and make them use it on everyone.

Make sure you know treatment

Pray for squall's lionheart, be careful what blue magic you use if you have quistis, use demolition ammo if you have irvine, and keep using punch rush and booya with zell (the top command, you can hit several times a second and do massive damage)

As long as you have the recover ability, you don't have to worry too much on rinoa.

If you have high strength, use meltdown and physical attacks. They work well.