World released on three platforms so far (who knows, they may have an upgraded version in the works for PS5/Series X/PC). If you averaged let's say 17.5 million MH world sales (it's been some months since 12/20) that's 5.83 million MH world sold per system on average. So if MH Rise sold 7.5 million on Switch then it would have sold considerably more per console released on (1) than MH World did (the PC sales being TBD for now since Rise hasn't released there yet). So 7.5 million on Switch alone is kind of crazy!
Monster Hunter 4 sold 8.3 million on 3DS. I’d say this has a very good chance of exceeding that.
But if we’re talking 3rd party developed software, there are many games developed by third parties that have sold over 15 million on Nintendo consoles. Of course, most of these are published or co-published by Nintendo. While technically third party games, they’re colloquially called “second party” - which actually isn’t a real thing since the second party is technically the buyer in a transaction; and third parties are creators of any component outside the first party to add to the item being sold.
But even Pokémon games aren’t true “second party” games either, since they’re only co-published by Nintendo.
I describe myself as a little dose of toxic masculinity.