Got Water Weak Odin down finally. Just turned most of my element resit into rainbow crystals, since 4 omni resist is enough with having the major resists too.
Bartz USB (Chase) + AASB + AOSB + OSB
Yuffie BSB
Strago CSB + AASB
Tyro USB (Wall) + AASB + USB (Astra)
Aeris AASB + USB (Last Stand)
I had a lot of failed attempts.
2 healers didn't quite work, Tyro keeps the damage below 9999 and can Astra away the saps. Aeris had the 3* regen ability to wipe sap too, its important because sap ruins last stand and you die at the start of P3 when he sets HP to 1.
I actually have Rikku's physical chain but Bartz will cap under Tyro's crit boosting AASB Or USB. So I actually did more damage with almost the wrong chain.
I have much better water DPS than Yuffie BSB and even have Rikku's imperil, but don't underestimate a full imperil stack. It's a huge DPS boost for P3.
Edit: Tried Holy Weak Odin right after and one shot it, WTF. That's my 5 Odins done
The team is the Final Fantasy Tactics Knight team with one of them having an AASB. Orlandeau, Agrias, Ramaz, Tyro and Aeris.
Nothing special about it other than use Lakshmi early for an Astra.