Highest selling DS game in Japan : New Super Mario Bros.(DS) - 6.13M units by week #230
Pokémon Black/White - 4.22M units by week #5
With it's first holiday season coming in,I think B/W has a very high chance to achieve this,it's already beaten the Wii champ there,which is New Super Mario Bros.(Wii) (4.04M by week #46)
So,do you think it will happen?Also,do you think B/W will become the highest selling game ever in Japan,which is atm Pokémon Red/Green/Blue (10.23M)?IMO that will be extremely hard.
Note:Sales data based on VGChartz numbers.