what is the rarest pet in adopt me

According to multiple sources, the rarest pet in Adopt Me is the Monkey King. It is a limited legendary pet that requires three Staff Ingredients (legendary toy) and one Monkey (a rare pet) to be obtained. Other rare pets in Adopt Me include the Griffin, Sabertooth, Golden Dragon, Diamond Unicorn, Queen Bee, Australian Kelpie, Frost Fury, and Evil Unicorn.