Zidane:LV87
Vivi:Lv83
Eiko:Lv86
Aramant:Lv84

It took me like half a year just to get them all to 80. I couldn't loose because everytime Kuja or the final boss, whoose name I can't remember, hit me I would just use Doomsday and heal my entire party. . That and I had all the status aliment cancelers on