While downloading ROMs for games you don't own is generally considered illegal, the Internet Archive operates under a different set of rules. As a library, it is allowed to preserve and provide access to digital content for educational and historical purposes.
The Internet Archive has a massive collection of ROMs for a wide range of consoles, including the Nintendo Switch. mario kart 8 deluxe rom internet archive new
Emulating a Nintendo Switch game requires a powerful computer. Make sure your PC meets the minimum system requirements for the emulator you're using. While downloading ROMs for games you don't own