ENEMY SKILL LIST
Skill
Description
Learned From...
Frog Song
Causes Sleepel and Toad
L4 Suicide
Causes critical damage and Mini on all enemies with levels in multiples of 4
Magic Hammer
Drains 100 MP from opponent
White Wind
Restores HP and status for all
Big Guard
Casts Barrier, MBarrier, and Haste on all allies
Angel Whisper
Revives and restores all HP and status
Dragon Force
Raises Defense and Magic Defense
Death Force
Makes character immune to instant death
Flame Thrower
Causes fire damage to one enemy
Laser
Takes target's HP down by half
Matra Magic
Causes non-Elemental damage to all enemies
Bad Breath
Causes Poison, Confu, Sleepel, Silence, Mini, and Frog
Beta
Causes big Fire damage to all opponents
Aqualung
Causes big Water damage to all opponents
Trine
Causes big Lightning damage to all opponents
Magic Breath
Inflicts big Fire, Ice, Lightning damage to all opponents
Stilva Disc 2 OR Parasite
????
Inflicts damage equal to the total damage taken by the caster
Goblin Punch
Non-Elemental damage
Chocobuckle
1 damage point for every time you have ever escaped from battle
Mideel Area Chocobo
L5 Death
Pronounces Death on opponents whose level is a multiple of five
Death Sentence
Pronounces Death on one enemy
Roulette
Pronounces Death randomly on one opponent or ally
Shadow Flare
BIG Non-Elemental damage on one enemy
Pandora's Box
BIG damage, ignores defense
Dragon Zombie, it must have all it's MP to cast

The best way to get an enemy skill is to have the Manipulate materia. Otherwise, a monster may only use its skill on itself , or not at all.

Acquire as many Enemy Skill materia as you can. Equip them on everybody. The skills learned from them are very handy.