I love how the twins just pop into existence their expressions are like, "What world just happened?! " XD There beady little eyes look so cute tbh. Idk if it's just me, but I can either imagine Mama Mew thinking "Oh score, I have twins now!" Or " Welcome to the world my beautiful children! Or both.
"We were raising your pokemon, and my goodness, we were surprised.
Your pokemon had an egg!
We don't know how it got there, but your pokemon had it
You do want it, don't you?"
Or when a Kangaskan hatches out of an egg, holding its child.
Or when a cubone hatches out of an egg wearing its mothers' skull.
It would be funny if breeders are always trying to watch the process but every time its about to happen something occurs and they look away for a split second and when they turn back the egg is just there.