Famitsu: Pokémon let’s go sold 664,198 copies in 3 days // Switch HW 180,585

[Chorlin]

Just as the title says.
Media Create will probably have bigger numbers, because bundles.

Also Switch Hardware was 180,585 units for the week. 

 

Source: https://nintendoeverything.com/pokemon-lets-go-pikachu-and-eevee-sell-664198-copies-in-japan-in-first-three-days/