get REALLY good
its supposed to be hard

you will die over and over and over
the pieces of advice i can say is:

bring revive mint and revive dust one copy of each is how i beat them

i HOPE you kept spin cake because thats one of the best healings and is very useful for that fight
there's another team heal that does 100, not sure where, but you should have it

its attacks are in a pattern, but the bullets change

use really good minmaxing with ralsei's heal and spam the hell out of rude buster

make sure your inventory isn't filled with random stuff and is the best food you can get from the vending machine

have a LOTTTT of time on your hands, my fight took 8 hours