Mmm... Mine was an eevee on Y. I hatched a literal 1000+ eggs that after that I gave up counting. I filled dozens of boxes then has to empty them. I didn't (and still dont xD) have a shiny charm in any game, so just Masuda Method~ I remember internally dying, jokingly showing my screen to my sister as I started the animation of another hatching eevee egg, like, haaa, is it shiny? And she started at it wide eyed. It was indeed shiny xD