Alright, so I'm confused by Yamask and Cofagrigus's pokedex enteries.
Yamask was once a human, and it carries the mask of its previous human life. It then evolves into Cofagrigus. Cofagrigus eats nearby humans and turns their bodies into mummies.
So that evolution line literaly breeds by killing a human and turning them into a Yamask, then waiting for them to grow into Cofagrigus to eat another human and restart the process.
Since all Yamasks have masks with the faces of dead humans, that means that in some way there must be a dead human involved in its birth.
Why/how is it that I can breed with another pokemon instead of just letting Cofagrigus eat the daycare lady?
I wouldn't take what the Pokédex says at face value since it has been proven wrong from time to time.