I'm sick of people bragging about their level 100 characters. My Squall does 9999 damage each hit at level 27, Ruby Dragons die in about 4 seconds because monsters level up as you do The only time it's ever advised to be level 100 is if you plan to fight Omega Weapon, and even for that, it's not a necessity (just make sure you junction to 9999 health)

So drop the thoughts about training right now! Unless you junctioning better magic to yourself as you level up, the only thing you'll succeed in doing is making Adel harder.

The Lunatic Pandora is a pretty mad place for magic though. Instead of leveling, equip Enc-None and run around the Lunatic Pandora for Draw Points. The draw points there seem to "respawn" their stock A LOT faster. Especially the Meteor by the staircase south of the elevators.

If I remember correctly, Adel has a pretty shotty Vitality stat. But in case I'm wrong, give her a good taste of Meltdown. My party of choice would be Zell, Irvine and Squall. Don't do anything but heal the party and Rinoa with Squall. Cast Aura on Irvine and Zell and let the limit breaks rip. Use Armageddon Fist (ie. Punch Rush and Booya over and over again. Quick fingers will get in about 8 hits per second) with Zell on Adel. Irvine's Shot is useful for this battle because you can select which enemy you want to hit and it does some great damage.

You may have to swap around some junctions for this, because most people tend to make an uber-Squall and leave everyone else with nothing but Fire or Scan etc. to junction. For Armageddon Fist to have full effect, you'll need to power up Zell.

That's about it.