The life cycle of a Pokémon remains an enigma to Day Care owners everywhere. Where do Pokémon eggs come from? Why do they only appear whenever a male and a female Pokémon (or a Ditto) are left alone together for a very long time? Professors remain baffled by this illogical conundrum. But due to vague parallels to human mating rituals, we’ve come to refer to the female Pokémon left in the Day Care as a mother, and the act itself as breeding.
They’ve proven themselves worthy of this title, as these “Pokémothers” tend to care for these eggs with the same passion as any human mother should. A Kangaskhan devotes her entire self to allow her child to grow up strong with many skills besides battling. Cubones keep mementos from their mothers close to their hearts, and brains, at all times. Baby Pokémon are doted on with luxurious incenses.
Indeed, a Trainer caring for both a Pokémon and its mother is proven to strengthen ties among Pokémon and even the Trainer's own family. At least, most Pokémon have such healthy relationships with their mothers. But Trainer society continues to perpetuate a dangerous lifestyle, tearing away countless Pokémon mothers from their children. We need to put an end to competitive breeding.
via destructoid https://www.destructoid.com/trainer-psa-the-dangers-of-pokemon-mother-negligence-502268.phtml