At some point, they will have to ease up on the regional exclusivity. They have already set a precedent by making Farfetch'd available worldwide. Maybe Mime Jr. will be a special event pokemon like Delibird, or maybe simply a rare hatch. I think at some point, Niantic will have to make all pokemon available, if only for a short while, in all areas.
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I wonder how they will handle Mime Jr...
All the other regionals do not have a baby form, but Mr Mime does. Will the eggs only be found in Europe when gen 4 arrives?
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If I remember right, some European countries also got other regionals (Romania not included sadly), and among those there was Kangaskhan, while Unown spelling EUROPE were also spread there. I wish I could have traveled there to get a Kanga, it's one of my favorites. But Farfetch'd will do for now, and people of East Asia got Kanga.