That was my first time as well and I can't seem to find an absolute answer on whether or not region locked Pokémon can be hatched.
The Shilph Road did a small study and they say "no" and a Niantic CEO said " no" as well but people are swearing that they hatched regionals.
I can see them being that rare, that a small study wouldn't produce results. I've been playing since July and I never hatched or seen a Lapras and I know they're out there. Makes me not know what to think