Ready?

CHAC

HP: 437850
MP:820

EXP:2200
AP:1(2 if oversoul)
GIL:750 (2200 o.s)

ELEMENTAL PROPERTIES:
FIRE - x1 ICE x2 LIGHTENING - ABSORBS WATER - x1

STRATEGY:

In each of the first couple of rounds, chac will use Heavens Cataract and will do mega damage. The best way to stop this is by fighting her in oversoul, then she will not use it. All attacks inflict unguardable petrification. A good strategy is to use 3 Samurai with dissmissal mastered, have everyone with auto-haste and auto-regen, and lay her ass with dissmissal, stopping her from attacking for a while. Get the timing right, and you can keep using it in succesion, and poor old Chaccy won't get a chance. Use mega potions to heal, and use special dresspheres only if they are mastered.

Now for the easy option. Have a gunner with lvl 3 trigger happy, and the cat nip. Go into battle with low HP and use trigger happy. Use this 3-4 times. Victory.

I won this battle with all girls at level 60+.