Pokémon Black and White launched in Europe on March 4th, 2011, 2 days before the games were released in North America. The games have now sold over a million copies in Europe and Pokémon White is now the second fastest selling DS game of all time in the UK.

Pokémon Black and White also sold a million copies on launch day in North America, while its already sold over 5 million copies in Japan.

Source: http://www.officialnintendomagazine.co.uk/