Today I killed some bosses. Teams used in case somebody wants to know were
>Mirror Container: Crown, CMaiden, Cinderella, Rouge, SAnis
Very straightforward, burst gen in-between bursts with Rouge and clear the slippers with her
>Harvester: Crown, QEQ, Siren, THelm, CLud
Similarly straightforward, just break the head and then keep shooting the core. Don't let the missiles or adds kill you on the higher stages
>Ultra: Crown, Siren, RH, RRH, MMast
Burst with MMast every 3rd burst except for the first 3rd one since the poison spit happens at that time and having Crown's shield will allow you to not take cover, after that it's MMast whenever her stacks are maxed. Core needs to be broken quickly so it respawns frequently enough to be almost constantly there. Use RH's B1 right after the phase shift together with a MMast burst since the parts respawn all at once then and the core has high HP. Cover the last poison spit because Crown's shield might not be enough past stage 8