Once the base has 99% HP, a distraction peon, Trolly Blogger, appears backed up by another Mr. Mole and a Winged Pigge. The peons continue spawning at the same interval. Another Winged Pigge spawns 3.3 seconds after the Boss Shockwave.
Start by stacking Cyberpunk Cats while stalling Mr.Mole and killing Gabriels with Macho Legs. Attack the base when you have a few Cyberpunks. Then let the attackers do their job and wait for a long time.
Jizo's Moving Castle is highly recommended since it can kill the Winged pigges in 3 hits without any other attackers and having lots of health.