First "month" sales for Platinum are in... (US, now w/April, May, July)

[Lindz]

May: POKEMON PLATINUM VERSION NINTENDO OF AMERICA NDS 805K

Not bad for 10 days worth of sales.

However, Emerald did a little better though it had more time:

April 2005 - 8,914 (broken street date sales)
May 2005 - 882,579 (first month)


April: POKEMON PLATINUM VERSION NINTENDO OF AMERICA NDS 433K
May: POKEMON PLATINUM VERSION NINTENDO OF AMERICA NDS 168.9K
June: n/a
July: POKEMON PLATINUM VERSION NDS NINTENDO OF AMERICA 116.4K

Total: 1,523,300

[Blastoise]

I'm actually surprised that Pokemon wasn't the best selling title in March (beaten out by RE:5's 360 version by about 180kish). Admittedly RE:5 was released earlier but still.

[Lindz]

According to a Nintendo financial report recently released they say Platinum is at 3.75 million worldwide. Pretty safe to assume its gone over a million in all three major territories (well we already knew it did in japan)!

Edit: 20,560,000 copies of D/P/P combined shipped worldwide as of March 29th 2009.