. They can be a real pain, but thankfully they're optional.
Boss Battle - Phantom
Clock Tower. Have Peter Pan in your party and talk to Tink at the Ship Cabin.
This battle is hard. I suggest that you have Donald in your party and not Goofy, since Peter Pan is a mandatory member.
Phantom will immediately cast Doom on Peter when the battle begins. (The countdown starts at 12 and when it reaches 0, the character dies with no chance of resurrection.) Now to freeze the counter, cast Stop on the clock. Be sure to do this as often as you can to prevent Phantom from ever using Doom again.
Your target here is the heart, which changes color whenever you hit it with the corresponding magic. YELLOW for THUNDER; BLUE for BLIZZARD; RED for FIRE & WHITE for PHYSICAL ATTACKS. The colors indicate his vulnerability. Be sure to time your attacks properly since he flies around pretty fast
When you see him stop in front of the clock, that means he's about to unleash a heat-seeking purple stuff at you which takes away a lot of HP, so avoid it at all cost. You'll receive the final upgrade for Stop (Stopga
) if you win.
Boss Battle - Kurt Zisa
Desert. Go to Aladdin's House and talk to the carpet.
Before you enter this battle, Sora must have both the MP Haste and MP Rage abilities... along with Strike Raid or Ars Arcanum. It also helps if you have a Ribbon accessory equipped, since it reduces both fire and dark damages by 20%. As for your items, bring some Ethers and Hi-Potions.
Once the battle begins, immediately summon Tinker Bell, since Kurt will seal away all your magic on his very first turn. Now your target here is the orbs in his arms. When you try to attack his orbs, he'll start flailing his arms around wildly. This will make the orbs pretty hard to hit. The best thing to do here is wait until you find a large enough opening to land a complete combo on the orbs. Also, don't worry too much about your HP -- let Tink take care of that.
Now when you destroy the orbs in both his hands, you'll be able to use magic again... in addition to that, he'll also break down and be helpless for a while. So move in and attack the head with all you got. Don't hesitate to unleash any of your special attacks on him. But watch out for neck though, since it can still do some damage.
Once he stands up, he'll immediately cast a barrier on himself. This will block all sorts of physical attacks, so don't bother trying. Instead keep casting Thunder magic on him to destroy his shield. When fire balls start appearing around the place, just keep running to lower the possibility of getting hit. Also, when you see a sandstorm form around you, Dodge Roll away to avoid it.
When you destroy his barrier, Kurt will break down again. Just repeat the entire process until you defeat him. One more thing... don't forget to cast Aero on yourself whenever you can.