DélioPT on 30 November 2016
According to Neogaf, the game sold 3.7 in the Américas (just under two weeks).
I assume this is a press release quote:
"After becoming the most pre-ordered video games in Nintendo history, Pokémon Sun and Pokémon Moon – the latest games in the wildly popular Pokémon franchise – have now become the fastest-selling games that Nintendo has ever launched in the Americas. In less than two weeks, Pokémon Sun and Pokémon Moon for the Nintendo 3DS family of systems sold a combined total of 3.7 million units. That’s an 85 percent increase over Pokémon X and Pokémon Y – the previous record holders for Nintendo’s fastest-selling games – during the same period when those games launched in 2013."
