Beating The Phantom

Very simple. The color of his heart determines what will damage him. Red for Fire, Blue for Blizzard, Yellow for Thunder, and Grey for physical attacks. Whenever he casts doom on your characters, immediately go to the clock tower and cast Stop on the arms. It will remain stopped for a full minute, reguardless of what version of Stop you have. Be sure to fill your inventory with Ethers and Elixirs. You will need them.

 

On Stopping the clock,you can stop it even before he casts Doom on someone.If your fast enough you can pre-empt this Heartless and Stop the clock right at the start before he Dooms anyone.Just make sure to stop it after some of your attacks.(I never knew tht it stayed stopped for a minute despite which one you used.Useful to know,saves some time.)

If Goofy has his MP Ether ability (The one where he gives you some MP from his own if I got the name wrong),then bring him.You'll be doing most of the damage even if you brought Donald,so its best for you to have as much magic as possible.Of course,like DW said,bring plenty of Ethers and Elixers (And the mega versions,though save some for the tougher bosses).

 

how to level up faster

If u wanna lvl up fast then choose in the begining of game for your adventure to start at dead of night. it makes u have to get more exp up before you lvl up, but at lvl 40 and higher you breeze through leveling up like nobodies business.