Chapter 9, right?
If you're going with the Lightning/Fang/Hope combo, use these paradigms.
Relentless Assault - Rav/Com/Rav
Combat Clinic - Med/Sen/Med
Hero's Charge - Med/Com/Syn
Evened Odds - Med/Sab/Syn
Bully - Com/Sab/Syn
Aggression - Com/Com/Rav
I doubt you have a problem with the first part of the battle, just always start off with Hero's Charge until Hope gets the buffs on for everyone, then switch it over to relentless assault. Also while you're doing this, use a librascope right at the beginning so you can have your characters auto hit the weaknesses. Once the barrier is down, use bully to debuff Barthandelus. Once you hit him with debuffs, switch it up to Relentless Assault and hit him hard/fast. If you are able to stagger him, it can sometimes cancel out his destrudo if he's charging for it, so keep that in mind. Once you stagger him, get the %age up a bit with RA, then switch to Aggression to do BIG damage and knock that health bar down a bit. It will probably take 2-3 staggers but that's the easiest way to take him down.
If you get hit bad with any attacks, switch to combat clinic asap and try to heal it out. IMPORTANT TIP: If any characters get KOed, don't even switch to CC, just use a summon (granted that you have enough TP). If you can, this will auto fully heal and bring everyone back to life, plus it will let you chip away at Barthandelus. Don't worry about doom though, you should have plenty of time to kill him regardless of the doom. Just keep playing aggressive and you will be able to win. Good luck!
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