From the last Nintendo quarter:
Super Smash Bros - 5,550,000
Super Smash Bros Melee - 7,410,000
Super Smash Bros Brawl - 13,100,000
Super Smash Bros 4 - 13,130,000 (8.23m 3DS / 4.90m Wii U)
Source
Super Smash Bros - 5,550,000
Super Smash Bros Melee - 7,410,000
Super Smash Bros Brawl - 13,100,000
Super Smash Bros 4 - 13,130,000 (8.23m 3DS / 4.90m Wii U)
Source