>>53771740This is exactly the reason why it's absurd that they keep this bit of lore that's never even been mentioned outside of that strategy guide for obvious reasons.
The process of how a Pokemon is born is a true enigma and has only ever been depicted as mysterious or otherwise whimsical (I.E. the mating ritual between Solgaleo and Lunala to create a Cosmog in the Alola games), and even early on eggs were never meant to be literal laid eggs, but rather cradles of nature to nurture a newborn until they're developed enough to fend for themselves that just so happen to LOOK like eggs, much like how Exeggcute is actually a batch of sentient coconuts.