Esper Graphics

Ah I see what you want now. I never really thought of doing that, and I have made it so enemies can summon espers.
I don't really think that's possible, but theirs always that possibility.
The way everyone uses FF6MDE is that you fiddle with the bytes, they aren't labled and neither are where you put those bytes. It's all guessing until you get the hang of it.
My only guess is that you find an attack that makes it so the enemy disappears and reappears. Find the correct bits for what makes him dis/reappear and change the bits you need for the existing attack.