It sure did for me too

Zell: Ergeiz (or however it's spell) and armaggedon fists
Squall: Lionheart
Irvine: Fast ammo which knocks off up to 99000 hp damage or even 100 000
Quistis: Mighty Guard
Selphie: Full-cure/aura casting
Rinoa: nothing. She dies *kamikaze*

note I don't approve of using invincible moon, hence Rinoa has no use in the entire game (plot wise as well) ^_^