It's not exclusive to the US, and is only going to stay in North America because GameStop is only in North America.
What? There are GameStops all over Europe.
My problem with this event is that Ireland and the UK are grouped together for events. UK events are only in Game and Gamestation shops. Neither of these are in Ireland (Game was but closed around 2 years ago).
Same thing happened with the Keldeo event. I found out about. I got excited. Then I found out that it was available in all Game and Gameststion shops in my area