who's the boss

Please help idk how to do this, you have to use eliza only and gain 30 buffs but eliza barely gets any buffs

I was doing a mission in who's the boss, expert, with two random characters. The character I started fighting with was Fillia. After doing my standard combo, followed by Gregor Samson, My BB3, "Blowout" was charged so I decided to use it. But suddenly, the Valentine I was fighting tagged out to...