Nintendo: Pokemon Diamond and Pearl both over 3 millions copys sold

[Just_Ben]

http://www.gamershell.com/companies/nintendo/372020.html

 

" According to the independent NPD Group, through July Pokémon Diamond is the best-selling video game of the year on any system, while Pokémon Pearl ranks No. 3.
The newly released Pokémon Battle Revolution already ranks at No. 5 on the list of best-selling Wii games for the year.
Pokémon Diamond and Pokémon Pearl for Nintendo DS have sold more than 3 million copies in the United States alone."

 

Do I misunderstand something or are VGChartz numbers way to low?¿?