Enemy Skill is a command materia that can is essentially the Blue Magic of Final Fantasy VII. The character who has the Enemy Skill materia equipped must have been attacked by the enemy using the skill to learn it.

Final Fantasy VII Enemy Skill
Skill	Learned From	Description
Frog Song	Touch Me, Toxic Frog, Christopher	Transforms target into frog and sleep
L4 Suicide	Mu, Trickplay	Critical damage whose level is divsible by four
Magic Hammer	Razor Weed	Steals 100 MP from opponent
White Wind	Zemzelett, Wind Wing	Restores HP and heals all status ailments
Big Guard	Bleach Plug	Casts Barrier, MBarrier and Haste On Allies
Angel Whisper	Pollensalta	Revives target to full HP and restores status to normal
Death Force	Dark Dragon	Raises Defense and Magic Defense
Flame Thrower	Adamantaimai	Target becomes immune to death
Laser	Death Claw, Dark Dragon	Halves target's current HP
Matra Magic	Custom Sweeper, Bullmotor, Death machine	Non-elemental damage
Bad Breath	Malboro	Casts confusion, frog, mini, poison, silence and sleep
Beta	Migdar Zolom	Extreme fire damage
Aqualung	Harpy, JENOVA Life, Serpent	Extreme water damage
Trine	Materia Keeper, Godo, Stilva	Great lightning damage
Magic Breath	Stilva, Parasite	Extreme fire or lightning or ice damage
????	Jersey, Behemoth	Elemental damage
Goblin Punch	Golbin	Physical damage
Chocobuckle	Chocobos	Non-elemental damage equal to battles escaped
L5 Death	Parasite	Casts instant on a target whose level is divisible by 5
Death Sentence	Gi Spector, Sneaky Step, Boundfat	Downs target in 60 seconds
Roulette	Death Dealer	Selects a random target to cast death on
Shadow Flare	Dragon Zombie, Ultimate Weapon	Extreme Non-elemental damage
Pandora's Box	Dragon Zombie	Heavy damage to all enemies