First you have to beat Ball, this can be easy or hard depending on your level. The easiest way is to have Rapp use Demon Ball twice then attack to save Sp, Fenna use Zapwhip then dragonzap then have her attack, Liete use all heal or symphony if your life is high and have Justin equipped with Spirit Sword and Ashura as Accessory. Then just attack to save SP. Attack Ball and ignore his partners. When you have done this go on the drop again to travel to the top floor. Get the items and use Liete spells to heal up then use an SP potion to heal your magic and the gold potions to heal Sp. Go to the hallway and engage in battle with Gaia. Use the same method but have Justin use Midair Cut. Don't use any thing with magic evolved or his last attack I do not know what it is because I did not need it. The Mega-Gaias should be your first target to keep them from producing more guys. Ignore the ones they produce because after you kill them they come back. After you kill the Mega-Gaias they die anyway. Take down both and then go after Gaia. Just attack because I was to fast for him and he did not hit me once. After he dies you have to beat his heart. He did not hit me once, all he used was cold and my guys were not effected. After this you beat the game.
Beat the first Gaia
To defeat the first Gaia you will need free experience. When Gadwin and Sue leave your party they leave experence in books. Use these books on Justin and Feena. Concentrate on attacking Gaia's body, not the arms. Once the body is gone the Gaia is destroyed. Use Midair Cut, Burnflare, Milda Kick, and Rapp's missle or discutter will finsh the Gaia quickly. Just to be on the safe side heal as much as possible.
Easy level up for water magic
If you reach a save point don't recover right away. Take any character with water magic and spend all of their MP casting healing spells. This will give you Water magic experience points. Then step on the save point and recover. This way you can get water experience, but recover the mp right away.
Ganydemede strategies
Use your strongest moves for about 10 turns and he's finshed.(I beat this boss in 5 minutes)
Hidden Mission
To access a bonus stage, go to the Zil Dessert on Disc 2. In the southern part of the desert, there should be a path in the canyon wall that leads to the castle of dreams. (If you still cannot find it, go south from the desserts exit alog the wall.) This area is just a place to gain exp and obtain the Lightning sword.
Hidden Mission: Soldier Graveyard
To access the hidden mission "Soldier Graveyard", you must enter the Zil Desert by way of Cafu (the real entrance). Once you are clear of the trees head right until you see a small brown building with massive doors. This building leads to the hidden mission...but the enemies there give very little experience, so this site is not as good for training as the "Dream Castle" or even the Zil Desert itself.
Master Chang strategies
You fight this battle in the Church of parm. To defeat Master Chang use Howl magic, V-slash, Puffy Kick, and Sue's water magic to keep you alive.
Nana,Saki,and Mio strategies
You fight these bosses in Garlyle Base. Use the same tactics for each girl. Use howlslash, W-break, Burnflame, Puffy kick and combos.(Note Nana is weak against knifes, Saki is weak against a V-slash attack, and Mio is weak against everything.)
Orc King strategies
You fight this boss in Leck Mines. Kill the Orcs first. To defeat this menace use V-slash and Puffy kick. Watch out for his fire breath.
Rock Bird strategies
This is the boss you fight in Sult Ruins. To kill this quickly use Justin's V-slash and have Sue use Rah-Rah if nessasary. Attack with combos after Sp runs out.
Squid King strategies
This is the Boss you fight on the Ghost Ship. This is one of the hardest Bosses you will encounter. The only way you will win is the dis-honorable way. Use Feena's Flame attacks and Justin's V-slash and have Sue heal any time to any one who is not at maxium HP.(Note: You will die if you don't use Flame Magic. Also you get your first Mana Egg here, use it to get Sue some water spells.)