Gil Toss is the best move, as long as you have money, and you get that from a samurai. It always hits for 9999, if you have the money of course, and it's worth it.

Otherwise, I actually mastered everything.
My characters ended up all being bare
Butz:
X-fight (Magic sword, 8 attacks)
Magic sword

Reena
X-Magic (two hastes on attackers, then two Meteo every turn, by far the best)
Time

Galuf/Krile
White
Dash/X-Magic (I like to run, then for big fights, casting two white spells, really helps)

Faris
X-Fight
(Random, typically Passages, so I can see secrets, then depending on the boss, probably white magic for the final boss, just for another healer)

THE JACKEL