Since they increased the speed on the Pulvizer you need a faster pet in the first slot. I used Lil' Bling with inflation. I used Magma Rageling 1/2/2 with shield for the swap pet with a Tinytron for backup 2/1/2 two shields. He killed himself using the Bling and Rageling so this works if you use the faster pet in the first slot.
Yeah I tried the cauldron and absolutely failed. Used your suggestion with Lil'Bling and boss was dead before the 5th turn. Lil Bling-Inflation Amalgam of Destruction- Fire Shield>Flame Jet>Burn Tinytron as backup (2/1/2) Didn't use