Pokemon Mystery Dungeon: Explorers of Time and Pokemon Mystery Dungeon: Explorers of Darkness sold over 209 000 copies combined in May with life-to-date sales reaching over 613 000 copies. Explorers of Darkness was number 9 on the sales charts for all system with 107 000 units sold and Darkness and Time was number 10 with 102 000 units sold respectively.

Source: http://press.nintendo.com/articles.jsp?id=15421