Pap Bombs

Just let the top bombs keep spawning and kill all the bottom ones. Eventually, Pap will be using the summon animation, but nothing will spawn. It's risky because when the clock dies, the final form might not appear due to the maximum monster population (or so I've heard).

I can confirm that this is completely untrue. I solo pap twice daily and this never happens to me. The spawn is maxed out halfway through first form, and when it dies, second form appears every time.