Do you people even check the previous event page before posting? There was an Arceus event last year in Europe. And in 2009 you could get it in the US, Australia and Japan at certain locations. Which is probably why the GTS restriction was lifted.
But those Arceus all have the Classic Ribbon meaning that they can't be traded on the GTS to begin with. Why lift the restriction when those Arceus can't be traded on there?