Pokemon Sword and Shield sell 1.3 million copies in Japan, biggest debut for a Switch title
Pokemon Sword and Shield, like most mainline Pokemon games, have had a very successful first few days of release. The pair of games managed to shift 1,364,544 copies within three days after launch in their home country of Japan, dethroning Super Smash Bros. Ultimate's opening week sales record for the Nintendo Switch. This number includes only physical copies, as Media Create, who tracks Japanese game sales, does not count digital sales. Nintendo Switch hardware saw a boost in sales, as well, reaching 180,000 units sold during the launch window for Sword and Shield.
Source