Location: Vault Inn
HP: 200(Bandit), 100(Per Thief)
Strategy: This, being the first Boss battle, is a fairly easy battle. Just keep using Psynergy until they are dead. Cure or use Herbs when needed.
Location: Bottom of Tret Tree
HP: 750
Strategy: The best way to tackle this battle is to put all the Djinn on set before the battle. Then, summon everything you can. After that, just keep unleashign/summoning, and curing when needed. Don't even bother trying to use a regular attack.
*SPOILERS*
Location: Top of Mercury Lighthouse
HP: 1200
Strategy: Saturos is a Fire Adept, so make sure to use a lot of Mia's Psynergy. Isaac should keep unleashing/setting Granite. The others should just either use high-PP Psynergy or Djinn unleashes/summons. Any time your HP is at the halway point or below, heal. You may want to use Djinn that lower Saturos's stats, also.
Location: Mogall's Forest
HP: 1000
Strategy: This is not a difficult boss. Just keep using Level 2 and up summons and garet's Psynergy and it should be finished off soon. As always, heal when needed.
Location:Altin Peak
HP:550
Strategy:This is actually a mini-boss. You fight three of these. You should use Garet's Psynergy and Djinn. Attack with Issac, use Ivans Psynergy. Heal with Mia. They shouldn't be to hard.
*SPOILERS*
Location: Altin's Peak
HP: 1400
Strategy: Before this battle, put everyone's dinn (except Mia's), on standby. Have everyone keep using summons, and have Mia keep using Wish to heal everyone. It should be knocked out after a few turns.
Location: Lamakan Desert
HP: 1700
Strategy: Before the battle, have Ivan's and Mia's djinn on standby. Right away, have them use Thor and Boreas, and have Isaac and Garet use Psynergy. Have Ivan keep using summons, and Miua healing with Wish.
Location: Ship to Tolbi
HP: 2400
Strategy: Before the battle, have everyone but Mia's djinn on standby. Start the battle with summons, then keep using either summons or high-PP Psynergy. Garet's summons will work best. Heal with Mia when needed.
Location: Collosso
HP: ???
Strategy: Our best advice for these guyts is to get to the arena first, so that you get the stronger equipment. Otherwise, the battle will be REALLY hard. What you should do is have all your Djinn but Granite on standby. That way, befire he can even strike, you can summon. Keep unleashing Djinn/summoning. Keep an eye on your HP, though. That is all you should use Psynergy for. Wait until you have about 100 HP left, then use Cure or Cure Well, whichever will raise your HP to teh max, or close. If you run out of PP, use the Nuts you got. You may want ot use the smoke bombs/sleep bombs first to lower their stats.
Location: end of Dodonpa's fortress
HP: 2400
Strategy: All you can do here is use summons and Psynergy. Fire works well against it. If you get poisoned or hurt, use Mia's healing powers. Her psynergy won't come in very useful, as it is water-based.
Location: Near end of Suhalla Desert.
HP: 3000
Strategy: This boss is weakest against Earth attacks, so put all Isaac's Djinn on set before the battle. Right away, have Isaac summon Judgement, and have Ivan summon the leftover Djinn, as it is resistant to Wind. Therefore, have Isaac keep using his Psynergy/Djinn, Garet attack and use Psynergy, Ivan use Psynergy to boost the party's stats, and have Mia keep using Wish/Wish Well.
Location:Suhalla Desert
HP:3000
Strategy:This boss is completely optional, he can also be fought as many times as you want. You should have everyone summon there level four summons, then have Ivan cast High Impact and have Garet and Isaac attack, and Mia heal like usual.
Location:Crossbone Isle (10th Floor)
HP:6000
Strategy:This is the hardest boss in the game, he is optional though. He is bad against Venus so summon Judgement as frequently as you can, attack with Garet, cast Psynergy with Ivan, and heal with Mia. You could also set all your Djinn on standby (exept for five of Mia's), so that you can summon all the level four summons. His attacks are generally strong so heal frequently. You might want to be at level 30 so that you can cast break because he uses stat boosting Psynergy on himself.
Location:Top of Venus Lighthouse
HP:3000(Saturos), 2000(Menardi)
Strategy:Have Ivan cast Impact on Garet and Isaac, Have Isaac unleash Flint, Garet unleash Fever, Mia unleash sleet on herself to boost her mercury power so that she can heal more. Have Isaac unleash attacking Djinn, Have Garet do the same, then summon. Have Ivan unleash Smog, Breeze, and Squall, then summon. Have Mia summon if able, otherwise Heal. Focus Summons on Menardi. Once she is dead, attack Saturos until he goes down.
Location:Top of Venus Lighthouse.
HP:5200-5300
Straegy:This is the final boss in the game, it is weak against water attacks. You should put Mia's Djinn on standby, but I don't suggest you put more than four, so that you still have wish and wish well. Start the battle by summoning Boreas with Ivan so that Mia can use Wish and Wishwell. Have Isaac attack and use psynergy, and have Garet attack because it is resistant to fire. Have Ivan use Psynergy to boost everyone's stats. Another option is to put everyone (exept Garet's) Djinn on standby and summoning with Ivan and attack with Isaac and Garet and have Mia use Wish and Wish well, and have Ivan use Psynergy to boost the party's stats.