One more question: Would I simply not be allowed to use my US version of Pokémon Diamond? I imported and use this save file for everything.
I do have a EUR version of Diamond too though, so it's not much fuss if I can't use the US copy, since I can just trade everything over. I'd imagine that they just mean an English language version though as there's hardly any difference.
You wouldn't be allowed to use a U.S. copy because of (1)Regional differences and random stuff being changed between the versions or (2)By importing a U.S. version, you aren't supporting the U.K. economy









