RK - Optimizing SD was a pain in the ass, but...
I fuckin did it.
Party:
Gilgamesh (R4 Ice Jump, R5 Wind Jump), +20% damage against Weakness RM,
Zack's Glove, FF9 Strength Ribbon (Protectga SB), FF9 Black Belt (+10 STR)
Terra (R2 Power Breakdown, R3 Blizzaja), Dualcast RM,
FF6 Wizard Rod (White Frost SB), FF8 Ten Gallon Hat, FF9 Silver Dragon Wing (+30 MAG)
Zack (Indoor Spell, Aera Strike), +20% Damage with Katana RM,
FF7 Masamune, Some FF7 Bangle I got two events ago, FF7 Wolf Pin (+15 STR)
Aeris (Faith, Curaga), Rod->Mind Up RM,
FF7 Wizard Rod (Aerith), FF6 Gaia Gear, FF6 Muscle Belt (+300 HP)
Mog (Water of Strength, Curaja), Healing +20% RM,
FF6 Holy Lance, FF5 Ninja Clothes, FF7 Shield Ring (+5 Mind)
Still very easy to get destroyed in the first few rounds with my setup, and in striving for lowering my number of turns I would often let buffs wane right when I was about to go in for the kill, which made me take more tries than I needed to probably. The fight basically had three rebuff timings, the most difficult of which was the last one since Terra was usually out of Blizzajas and SG had run out.
Oddly, on all but the winning run Dualcast was going off frequently. I was kinda concerned that since Dualcast hadn't gone off that turn I would lose the medal on turns taken but fortunately I still made it in under the threshold.
Now, the Elemental Gigases for the next event... I'm either gonna be really glad I spent the orbs honing elemental skills or I'm going to be really annoyed. Depends on how the fight is actually structured. Really wish I could look into the future like you all and plan ahead, but I'll settle for having a way easier time getting from Zero to Hero. It was only, what, two months (+1 week several months ago) between starting up and getting my first Divine mastery? Yeaaaaaah.