STRATEGY
Here is a little strategy to help you beat Adel.
TAKE NOTE: THIS WON'T HELP YOU IF YOU HAVE ALREADY DEFEATED SEIFER. YOU CANT GET OUT OF THERE AFTER DEFEATING HIM.
Of course you know that she has junctioned Rinoa onto herself so that when you use big giant magic powers that hurt more enemies at the same time, you'll also hurt Rinoa. She also draws health from Rinoa from time to time. This makes up for a nasty battle in which I died many times. Until I thought of the following strategy:
I took my party and went to the isles Closest to Heaven and Hell (with my No Random Monsters add on!) which has an awful lot of (invisible) draw points. Just walk around the little islands pressing 'x' all the time and you'll find them. (And get some great spells might I say). Now what you need is Firaga, Blizzaga, Thundaga and Waterga. When you have 100 of each (or close near that number), you head back to the Lunar thing where Adel is.
Now what you need is Triple.
Head into the battle and cast shell, protect on your party to protect you from her Meteor and Earthquake spells.
Then only use Triple >> Firaga/Blizaga/Thundaga/Blizaga on ADEL. This won't do any damage to Rinoa but it will cause Adel a great deal of damage every time.
Keep one party member on standby to cure Rinoa and
THATS IT!
This should help you :)
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