ff7 doesnt use a pallet swap for the models. instead every version of a model are poly painted and that information is stored in the p files. So there is no way to have AI change an enemies color. You would need extract the battle.lgp and use kimera to edit the color of the files. but i do not know if thats possible on the psx version.
I'm asking this because i viewed some videos in youtube of Funny Enemy builded by Gameshark(2009).
This videos and the post of that year i get the AI for making them Biggers.
I using the Psx version, and in the moment is possible to change the color by Hex Edition(Varyneruel did in youtube), but i not have some time to do.