I wasn't really taking damage at all, except for one Vilo-whatsit Barrage and the Drown TP move. Chakra took care of most of it though. It hit me exactly once at like 5% HP because I stopped caring about Shadows and just wanted to finish it off.
I took 0 damage from 100% to 52%, when it stopped using Primal Drill and Boost and got Drown on me. It barely used any TP before 50% anyway.