Here's a quick way to beat 2nd Barthandelus. Took me a few tries to figure out but this is especially useful for ppl who did not so much grinding like me (pretty much none) and have less than maxed out characters.
I used Vanille, Light, and Snow but basically, you just need a good medic/rav, commando/rav, and commando/sentinel
Since he doesn't have any super powerful attacks, but rather very quick ones, you'll be healing alot. For most of the time, I was in Diversity, playing as the medic/rav character and constantly use cura and cure on the characters if their health was below %65. You'll want to play as the medic because if you let the AI handle the medic role, they don't heal you all the way, and when Bart uses a debuff on you, the AI tends to cast esuna to get rid of the debuff even though you're health may be really low. Also, if one of your AI characters has super low health, let them die and restore them with phoenix down to bring them back to almost full health. That's much faster than trying to cure them.
So pretty much with Diversity, you will constantly heal your allies while they stagger and dish out damage.
When you're in good shape, switch to relentless assault but don't stay there for long. Switch back to diversity as soon as someone's health falls below 65%.
When he does that super attack where he shoots blue lazers from his face, switch to solidarity so you're sentinel can absorb the damage and get ready to heal. Once he does that attack, switch back to diversity.
When he is staggered, switch to medic-commando-commando (forgot what this is called). Basically, physical attacks do much more damage to him than elemental ravager attacks. Snow was dishin out over 80,000 damage per hit with physical attacks while Bart was staggered.
Other tips:
At the start of the battle make sure your TP bar is completely filled. When you stagger Bart for the first time, use Vanille/Hope, whichever you're playing as medic, to summon. When the stagger bar falls to about 70%, go into gestalt and beat the crap outta him. Make sure you do you're finishing move while he is still staggered!
As the battle progresses, you're TP will refill back to 3 from 2. Summon again when he casts doom on you and use the same strategy.
That's pretty much it, I managed to beat him with over 700 left on the doom clock. (edit: he cast doom at around 800,000hp)
Paradigms that included saboteur and synergist roles were useless pretty much. synergists helped a little with reducing the amount of damage taken but its not necessary since you're goal is to stagger Bart as soon as possible and using synergist/saboteur often may not leave you with enough time to finish him when he casts doom.
Recap:
Diversity, Relentless Assault, medic-com-com, and Solidarity were the only paradigms I needed. PLAY AS THE MEDIC. Summon at the start of the battle, again when he casts doom.
I used Vanille, Light, and Snow but basically, you just need a good medic/rav, commando/rav, and commando/sentinel
Since he doesn't have any super powerful attacks, but rather very quick ones, you'll be healing alot. For most of the time, I was in Diversity, playing as the medic/rav character and constantly use cura and cure on the characters if their health was below %65. You'll want to play as the medic because if you let the AI handle the medic role, they don't heal you all the way, and when Bart uses a debuff on you, the AI tends to cast esuna to get rid of the debuff even though you're health may be really low. Also, if one of your AI characters has super low health, let them die and restore them with phoenix down to bring them back to almost full health. That's much faster than trying to cure them.
So pretty much with Diversity, you will constantly heal your allies while they stagger and dish out damage.
When you're in good shape, switch to relentless assault but don't stay there for long. Switch back to diversity as soon as someone's health falls below 65%.
When he does that super attack where he shoots blue lazers from his face, switch to solidarity so you're sentinel can absorb the damage and get ready to heal. Once he does that attack, switch back to diversity.
When he is staggered, switch to medic-commando-commando (forgot what this is called). Basically, physical attacks do much more damage to him than elemental ravager attacks. Snow was dishin out over 80,000 damage per hit with physical attacks while Bart was staggered.
Other tips:
At the start of the battle make sure your TP bar is completely filled. When you stagger Bart for the first time, use Vanille/Hope, whichever you're playing as medic, to summon. When the stagger bar falls to about 70%, go into gestalt and beat the crap outta him. Make sure you do you're finishing move while he is still staggered!
As the battle progresses, you're TP will refill back to 3 from 2. Summon again when he casts doom on you and use the same strategy.
That's pretty much it, I managed to beat him with over 700 left on the doom clock. (edit: he cast doom at around 800,000hp)
Paradigms that included saboteur and synergist roles were useless pretty much. synergists helped a little with reducing the amount of damage taken but its not necessary since you're goal is to stagger Bart as soon as possible and using synergist/saboteur often may not leave you with enough time to finish him when he casts doom.
Recap:
Diversity, Relentless Assault, medic-com-com, and Solidarity were the only paradigms I needed. PLAY AS THE MEDIC. Summon at the start of the battle, again when he casts doom.
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my crystal thingy is all levelled up to level 3 (the highest it can go atm) I have no idea what I'm supposed to do 
