Help with battle in Final Episode-Kingdom Hearts BBS?

I'm kinda stuck in the final episode and cant even get pass Terranort (Terra+Xehanort). The sad part is that im only a level 29 because i didn't know all my data from the main file was gonna be transferred over otherwise i would've trained more. Anyways, i would like if you guys could give me as much advice as possible in how to defeat him. I would also greatly appreciate if you guys can give me the names of some useful commands to use and which ingredients are needed in order to obtain them. PLEASE HELP ME....I'm getting tired of dying so much XD. Useful links would be appreciated.