I could have sworn this had been uploaded here before...? Maybe I just recall having seen it on pixiv or something and am imagining things. It's strange, but oddly adorable in a way.
Pikachu are are ostensibly mammalian so laying eggs should presumably seem more out of place than producing milk. Though as mentioned, c.f. the platypus and echidna.
This acctualy makes more sense than the game. I mean, really? They are ready to fight as soon as they are born? Seems like a croc of shit to me. I also find it wierd that all pokémon reproduce by laying eggs.