3 Owlbrows will spawn at the start. After hitting the Enemy Base, J.K Bun Bun will spawn when around 20,000 damage is dealt to it and I.M. Phace, a few Angelic Gories and peons will spawn when around 30,000 damage is dealt to the base, at around 40,000 damage to the base 2 Chickful A's will spawn with Dark Otters and Doge Dark.
Chip the base health slowly so that you won't be fighting all the enemies at once.
Note: Do not use Awakened Bahamut Cat here, as it does not do well against any of the enemies.
Once the battle begins,get the Owlbrows near the base. When they get close enough, spawn meatshields (except for Crazed Tank and Eraser Cat), King Dragon Cat and Crazed Gross Cat, while upgrading your wallet. After the Owlbrows have cleared, save up money. When J.K Bun Bun appears, let them get close to the base. Start spamming meatshields, Crazed Gross, King Dragon, Crazed Dragon, and such. Also spawn Ururun Cat and Bahamut. When the base is hit, the Xenomorph wannabe: I.M. Phace appears, along with some other annoying enemies. Spam meatshields and everything else. When Bahamut and Ururun Cat are available, send them out. I.M. Phace should slowly lose his health. When he dies, there is nothing else that can stop you, so go claim your victory! You can alternatively use Mission Control Mekako and/or Kasa Jizo for an excellent result.