Any tips for Titan Summon @ Full Might battle?

[Swaggaccino]

I'm going with Cloud, Aerith, and Barrett. Cloud is my damage dealer, Aerith has the wind + heal magic, and Barrett is the tank. I've gotten this fool down to 25% health but he always pulls out a BS attack. Aegis Shield wastes my time and ground smash attack towards the end always catches me off guard and kills at least 1 party member then it's over so I pretty much have Aerith's wind attacks on standby half of the time to counter that.

BTW it's BS we can't use items during combat sim fights.

[GarmiXGaming]

ok

[Clife Gainslock]

Well the way I did it was with, Cloud, Tifa and Aerith first get him pressured from dodging his "Thwack" or his grab attack have cloud ready with two ATBs to fill his gauge really quickly and prepare tifa also already so you can bump up the numbers once he is staggered
With Aerith also carefully setting up her Arcane Ward Wind Combo for when he is pressured

Afterwards its just a matter of do you get his Aegis Shield down before the attack or not, you can survive it if everyone is full life and then finish the rest of the shield, try perfect blocking and your Synergy block skills/attacks and you will get this shield down fairly quickly, once shield is gone you have more then enough time to stagger him and once staggered rinse and repeat he should die in his second stagger phase

[Axer]

Don't bother with wind, just have cloud go nuts on him.

Use firework blade soon as you can, tho a good time to use it is on his hand when you have to to prevent hsi big attack - control aerith a few seconds to charge up some synergy pips. (Aerith and Cloud synergy skill) to unlock clouds cloud super limit break.
Play cloud and perfect dodge/block everything to get him staggered asap, really need him pressured fast, if he doesn't do any moves to pressure him fast, restart the fight. Equip tifa with auto - unique so she builds up titan stagger dmg % with unbridled fury.

Once it's at ~200%+ unload some Bravers on him, and the lvl2 limit break at the end to win.

If your ~lvl21+ with all the right materia and accessory to max clouds dmg, to should get him before he wrecks everything with his ultimate.