Pokemon Sun and Moon sold 1,905,107 units in its first 3 days in Japan according to Famitsu's report http://www.famitsu.com/news/201611/22121241.html
This is slightly down from X and Y which sold 2,096,050 in its first 2 days (so 1 day less of tracking than SM got here). This doesn't include digital/eShop sales but includes double packs and DL cards. Total 3DS family hardware sales in the Sun & Moon launch week were 113,987.
This is the second highest first week sales for a 3DS game in Japan after X & Y. And the ninth highest first week sales of all time in Japan.
Ranking of Pokemon debut sales in Japan thanks to https://sites.google.com/site/gamedatalibrary/game-search:
This is slightly down from X and Y which sold 2,096,050 in its first 2 days (so 1 day less of tracking than SM got here). This doesn't include digital/eShop sales but includes double packs and DL cards. Total 3DS family hardware sales in the Sun & Moon launch week were 113,987.
This is the second highest first week sales for a 3DS game in Japan after X & Y. And the ninth highest first week sales of all time in Japan.
Ranking of Pokemon debut sales in Japan thanks to https://sites.google.com/site/gamedatalibrary/game-search: