Nikke - Union Raid (UR11): Rebuild Stout [Stage 6] 205.2M+ damage w/ recommend team 1
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The units I used for this battle are Volume, Guilty, Red Hood, D, and Rapunzel. The team's Skill levels and equipment are shown before the fight begins in this video. I recommend using team for not just for survivability and fact that it's weak against wind, but you'll need a sniper unit with passive piercing in order to quickly destroy the head part to take down the shield. Be cautious of the boss' attacks when it's shield-less for it will stun your unit for a few seconds. Best of luck to you.
To find out which units are in the meta, I recommend checking out this tier list so that you know who to focus on when it comes to skill building priorities:
https://www.prydwen.gg/nikke/tier-list/