To get magnet for the atlantica level you have to beat halloween town. If you already beat it then do it again, i'm pretty sure that's what you have to do.
[Edited by skull_master, 4/16/2006 11:59:20 AM]
The best place to find serenity crystals is in Naughts Skyway in the world that never was. The people that drop them are at the end of that area so just keep beating them until you get one.
I got everything maxed out including summons.
There isn't an end to the amount of orichalcum's you can get. You can get them wherever, but they are just rare to get. I got alot of them by fighting the enemies in Agrabah. Right now i have about 30 something of them.