I was playing very sloppy in this fight. Even with cheats Xaldin is difficult to defeat. In my opinion he is the strongest member in the Organization b/c of his ability to protect himself constantly, while attacking you.
Well this fight should have been Kingdom Hearts 2 final boss b/c Xemnas is just a fucking beast on this game. His attacks are more deadlier and somewhat similar to Lingering Spirit Terra and Final Xemnas combined