Strat was straightforward.
Went Left Arm > Right Arm > Body.
Part 1:
WoL: Brave Presence
Rem: Undying Wish on WoL
Tidus: Get pumped! for buffs, Quick Hit for damage
Aileen: Piledriver for damage, Refreshing Tool to mana battery sometimes
Rikku: Synthesis > HyperNullAll a lot. Bushido Freedom to Dispel the Robot. Sometimes Al Bhed potion when Tilith uses Prism Heal for Mana battery.
Tilith: First turn Celestial Light for buff, then after that Radiant Light and Prism Heal when I can get away with it.
Part 2:
WoL: Light is With us mixed in with Brave Presence.
Rem: Starts attacking a bit with the Boomerang.
Everyone else is the same.
Part 3:
Rikku: No longer needs to dispel, but can use LB to counteract World Destroyer when the Light Gathers. I did this probably 3 times. Can also use her Water attack instead, but only do this if Hyper Null All and Get pumped! are all ready. I did this twice.
Everyone else is doing the usual. It is critical in Part 3 to keep Hyper Null All and Buffs up at all times.
There were a few scare moments. Like, Tidus would die because I forgot to refresh buffs on the team, and so there goes a Phoenix Down.
Or WoL died THROUGH the reraise once. In that case I had Tilith Revive and put Auto-Revive from Rem on Aileen instead, because I knew she was going to get it. I ended the fight with one Phoenix Down left.
Glad I got it all in one go. My first attempt actually. Just took a long time. I played the fight slowly.
I had Gaia blade on Tidus as his sword, to try to take advantage of Earth Imperil. But Quick Hit and Piledriver don't chain all that well. But at least Tidus brought buffs, which was useful, because Tilith and WoL were always busy and Rikku got no LB until Part 3 of the fight.