Nintendo Co., Ltd. released their
Earnings Release: Third Quarter Ended December 31, 2013 report on January 31st, 2014 and announced that "During the nine months ended December 31, 2013, for “Nintendo 3DS (3DS, 3DS XL and 2DS),” “
Pokémon X/Pokémon Y,” simultaneously released globally in October, marked 11.61 million units in sales."
Source:
http://www.nintendo.co.jp/ir/pdf/2014/140129e.pdf