Pokemon is bigger than Halo.

The long awaited 5th generation Japanese release of Pokemon Black and White out sold Halo Reach... in Japan.

Gamespot.com posted some stats earlier.
"
JAPAN GAME SALES WEEK OF SEPTEMBER 13-19, 2010
Software:
Rank / Title / Publisher / Platform / Unit sales
1. Pokemon Black and White / The Pokemon Company / DS / 2,557,779
2. Front Mission Evolved / Square Enix / PS3 / 51,084
3. Yu-Gi-Oh! 5D's Tag Force 5 / Konami / PSP / 45,879
4. Halo: Reach / Microsoft / X360 / 44,413
5. Wii Party / Nintendo / Wii / 36,547
6. MonHun Nikki: Poka Poka Ailu Mura / Capcom / PSP / 28,627
7. One Piece: Gigant Battle / Namco Bandai / DS / 28,123
8. Blue Roses: Yousei to Aoi Hitomi no Senshitachi / Nippon Ichi / PSP / 9,846
9. Taiko no Tatsujin DS: Dororon! Youkai Daikessen!! / Namco Bandai / DS / 8,729
10. Super Mario Galaxy 2 / Nintendo / Wii / 8,178
"

Posted by SLG_Rady