You clearly haven't read up on the region locking of dsi enhanced games.
http://www.destructoid.com/japanese-pokemon-black-white-is-dsi-region-locked-184465.phtml
This also applies to International Copies on Japanese Systems. Fact-check first.
http://www.destructoid.com/japanese-pokemon-black-white-is-dsi-region-locked-184465.phtml
This also applies to International Copies on Japanese Systems. Fact-check first.