need some enemy skills?

[Randgris]

From Harpy in he Gold Saucer area. You can manipulate one.

[chronic_Maniac]

When you fight serpent hit him the first time for 9999 damage. This will make it counter with aqua lung. Thats what I always do. After I got the skill I'd be in the sunken ship morphing creatures to get sources. When I had yuffie with sneak attack- morph, She'd hit the serpent for 9999 damage each time. The monster would always use aqua lung afterwards. Another way I found is when its low on hp.
As for my records these r the creatures I found that have enemy skills.

Wind wing, Vargid Police, Trick Play, Toxic Frog, Touch me, Stiva, Sneaky step, Serpent, Razor Weed, POllensalta, Parasite, MU, Midgar Zolom, Materia Keeper, Malboro, Jersey, Jenova Life, Godo, Goblin, Gi Spector, Gargoyle, Dragon Zombie, Dragon, Death Machine, Death Claws, Dark Dragon, Custom Sweeper, Cactuar, Bullmotor, Blue Dragon, Behemoth, Beachplug, Ark Dragon, Allemange, Adamantaimai.

Thats all that I have found.

[yuno]

as for the harpy,the regular harpy in the gold saucer area appears only on the desert,and if you don't have the buggy anymore,you cannot fight a harpy.or can you?

you actually can encounter a harpy in the gold saucer area without the buggy.but it requires a certain action.equip the chocobo lure on a party member,fight on (you guessed it) the chocobo tracks.sooner or later,you will find a chocobo with a harpy companion.learn aqualung.