Apologies for the double post.
After dealing with D??? Jenova, this D350 CM was laughable. D350 Bizarro Sephiroth CM mastered, full medals
CLoud (LM2/LMR): R3 Tornado Strike, R4 Raging Quadstrike, Swd DMG+30% (Glint/USB1/USb2/AOSB), double wind boost
Yuffie (LM2/LMR): R2 Reflecting Pool, R4 Raging Waters, Water DMG+30% (USB2), double water boost
Shelke (LM1_LM2): R3 Entrust, R5 Wrath, Ace Striker
Aerith (LM1+LM2):R2 Hastega, R3 Curada, Mako Might (USB2)
Zack (LM1+LM2): R5 Life Siphon, R4 Ripping Blast, Battleforged (CSB/BSSB), one wind boost
RW: Divine Veil Grimoire
Magicites: Tiamat, Gizamaluk, Kraken, Silver Dragon, Evrae
Slow resists accessories on everyone.
Cloud took out the Right Magic, Yuffie took out the left, overflow AoE damage from Cloud took out the head, Yuffie destroyed the core, and Cloud finished off what was left of the Main Body.
The incoming damage is pretty low, it seems. I didn't kill the arms that quickly - even after I got Cloud Glint+USB online, it took two more turns to kill the Right Magic. Yuffie took a number of turns to kill the left. The whole thing was fairly slow going due to no SB generation from weakness. I actually had to refresh Zack CSB at some point, though it was defeated halfway through the second casting. Also refreshed Wall near the end, though I'm not sure it was necessary. I used Aerith USB2 more to speed up turns than to heal damage, and only used it twice.
This was the same team I used against D??? Jenova, except this time I actually got to use Cloud AOSB, LOL. It was completely unnecessary - sure, it did 700,000 damage to the Main Body, but it was already at 30% at that point.