If you see a Galuf in your group, do NOT leave. Bear it out. Just had a group that had Vaan and Cloud, and because things were going badly during Chimera (see pic below), they both quit. Galuf makes a joke of Dr. Agon. Outside of his few spells that he casts, the boss cannot hit Galuf, making this an easy fight. The pic below is essentially exactly how we came into the second half of the fight. The boss never hit the team once except for a Firaga spell and a Summon took care of that. Galuf for life!

(sorry I didnt show an after pic, I forgot to take one before making this post)

https://m.imgur.com/a/JW5cj

*EDIT: even yet MORE proof. The second player gave up and died vs chimera. Me and Squall finished it from there. Never got hit once

https://imgur.com/afkDzOq