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Redlet here. Beat Cobalion! Here's what I used:
>Team 1: quarter gridded Flannery, (never used burn though) Sync Hilda, Troublemaker Agatha (Sleep of course)
>Team 2: Roxanne, ungridded Flint, Cryogonal (to Freeze, Haze away buffs and Endurance stall)
>Team 3: Skyla, Brendan, (mine is 5/5) Speed Meowstic
Team 1 was a struggle to keep using attacks without accidentally Lick paralyzing Cobalion, but once speed is high enough you can swap to safe Shadow Balls. Gengar dies as soon as Cobalion gets a Sync, so keeping it asleep as long as possible is very important. Be weary of Sleep running away when you're Sync attacking and such too, because you'll lose all your damage. That's why it is better to rotate Hilda, Flannery, Agatha than Hilda, Agatha, Flannery. Team 1 got me 75% through second bar.
Team 2 was easily my weakest team. All I wanted them to do was finish bar 2 and reset Cobalion's buffs. Had to reset alot for initial freezes from Cryogonal and got some lucky ones later. Definitely the least ideal and could use reworking.
Team 3 is exactly what you'd expect. Skyla buffs and Potion stalling while Meowstic keeps Paralysis on Cobalion so Brendan can keep wailing on it. Meowstic can stall a bit with We're Not Done Yet after Skyla goes down, but finished with plenty leeway.
I'm sure there's better teams, but there's my story. Hope it helps someone struggling.