Cool.

FF7 -I've already given these.
FF8 - Best: Renzokuken/Lionheart
Worst: Selphie's random magic trout.
FF9 - Best: Vivi's Doublecast. One of the few ways to top 9999 damage in a turn in the game.
Worst - To my recollection Quina's just makes eating easier
FFX - Best - Auron's Bushido
Worst - Wakka's Reels. I always hate slot based limits.