Let's say, you have the Togepi egg from Cynthia in Platinum, and you somehow managed to enter Mystery Zone (Walk-through-walls, or hacking maybe). You see, egg-hatched mons always has the "[trainer who gave it to you]" and "Hatched in [place]" in their summary page in the Generation 4 games. So...what will happen if you happened to hatch the Egg when you're in Mystery Zone? What will the summary page for the hatched mon say? "Hatched in Mystery Zone"?
I was strolling around to hatch my newly-bred Eevee egg and was randomly wondering about this.