Japan Sales Week 49 Media Create/Famitsu/Dengeki - December 3-9, 2018

[TruckOSaurus]

xMetroid said:
Amazing debut for smash, definitely not a niche title anymore (probably since smash 4, even brawl was unknown by so many).
Maybe 5 million debut WW is possible. Switch looking at crazy December sales once again.

I'd say only the N64 could be considered niche. Melee is the GameCube's highest selling title over Mario Kart Double Dash and Mario Sunshine. Brawl is standing strong at 12m units sold. In terms of sale power it's only outdone by Mario Kart and 2D Mario.