What do you mean, 'for the ePSXe emulator'? You mean for the PSX release? Open your ISO and extract the SCENE from the DATA/BATTLE directory, and the KERNEL from the INIT directory.
Also - friendly tip: if you're still having trouble handling ISOs and actually modding / building PSX games, you're probably not yet at the stage where you can build an enemy from scratch. I've been doing this for almost two years now, and even I find it troublesome, because there are so many things that can go wrong. If you insist, though, at least print out my thread on debugging data errors and learn to keep backing up the files you work on. That should save you from some insanity, at least.
As for AI, how much experience do you have with assembly programming? AI is written in an assembler-like scripting language that's still not fully documented. Don't take this the wrong way, but if you're thinking "what's assembler?", I don't think you're ready for it.