According to the Media Create Sales charts, Pokémon + Nobunaga's Ambition (ポケモン＋ノブナガの野望) sold 172,027 copies the first two days of its release. It was the top selling video game in Japan for the week of March 12th, 2012 to March 18th, 2012. It was the only Nintendo DS game in the top 50 other than Pokémon Black and White which was in 36th place for the week.

Source: http://www.neogaf.com/forum/showthread.php?t=467305