as far as i remember dragon zombie only apper on the side that doesnt contain the magic pots and the movers.....they are in the section with the spiraling path..

all i ever did to get the enemy skill was manipulate them....but then again maybe its your versions....

also im not sure this was clarified correctl but ill say it just in case...

if you equip one character with all 4 enemy skills....but one enemy skill materia has the pandoras box technique....when it is sued again...NONE of the other materia will learn it...... the enemy skill that DOESNT have the enemy skill cannot be attached to the same character that has the enemy skill that DOES contain Pandoars box...hopes this is of some help....

P.S. i dont think you can get back out of the path to JENOVA once you start your descent ...in case anyone mentioned that..... because i know you can fight Dragon Zombies there.

hope this helps