yea, you just need to heal every turn with someone and use the best attacks with everyone else. if you happen to lose a few characters at once spend the turn reviving and healing.

Rydia should case Flare since it's fast and powerful. You could try having Rosa cast Holy and having Edge use elixirs on people for healing instead, if you have a lot of elixirs, but that's probably not worth the trouble. You could also bring both Porom and Rosa so you have a healer and a Holy user.