Two attempts with 192 3/1/5. Second attempt used all ap, red ap and damage boost. Got hit by one red and 2 turns later recovered all hp thanks to a well timed yellow.
I finally got there with my 188 4/2/3. No boosts because the odds were too long. I lost count, but it had to be around 20 attempts. Got very very luck with a green cascade and downed him with < 200 hp.