To breed Mammorest, you need two parents whose average breeding power equals exactly or is closest to 300. The lower the breeding power number, the rarer and stronger the Pal is generally considered in Palworld.

You can use our Target Child Calculator to see all the exact combinations of parents that will result in a Mammorest Egg. Ensure you have one male and one female parent, and place them in the Breeding Farm with Cake.