Attacks called "Unnamed" are attacks that don't have a name in battle, physical attacks for example but also dialogs in battle, that doesn't mean they're not used in the game. I don't have an exhaustiv list of the unused attacks but I can give you some : 235, 379, 382, 383. That's not much but you can use physical attacks that are used by just one enemy, put another ID for its attack (it's quite aneasy to explain in english ^^). You can also use dialogs unused, Edea have one or two at the end of disc 1. You can also delete Ultima, Quake, Tornado at the end of the list. And finally, you can do whatever you want if you decide to change all the actions of all enemies of the game. ^^