Jill the Aerodactyl - she, ah, delivers unwanted bodies from various places around the land. Most Pokemon have superstitions about graves, so they like to send their dead to The Boneyard, which is a giant graveyard. She visits a different village or area each day and returns in the evening with the bodies. She once lived in the Prismatic Jungle, serving Tivoli.
Ivory the Mandibuzz - the owner of the land alongside Chex. She and Jill serve as a sort of substitute set of parents to him. She ... takes care of any bodies that haven't been yet reduced to a skeleton. All bones are passed on to Chex to organize as he pleases.