Where it comes from
The line in the source
予約だけでニンテンドーDSソフト史上最多の188万本を記録 In English
Pre-orders alone 1.88m (Media Create)
Explore / Figure
Record
Preorders BW, Black/White pre-release
1,880,000 units Black/White pre-release
ReportedReported by a reliable secondary source, or read carefully from filed documents.