Classy way to kill Emerald:

Materia Setup
Gravity=HP absorb Gravity=MP Absorb Gravity=Quadra Magic W-Magic=HP plus

"This method is just fun. Every time you use gravity it will do 9999 damage to
him for the first 92 attacks. After that depending on what level of gravity
you are using the attacks will decrease. But you will be getting off eight
gravities per character and absorbing back about 4000 hp every turn. This
method is just damn fun and insulting!" - Apathetic Aardvark