While there is no official PC version Super Smash Bros. Ultimate
After some digging, John discovered that the website he had downloaded the game from was not authorized by Nintendo, and the game might be a pirated version. He realized that he had made a mistake and decided to take down the game.
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If you’re a tech-savvy user still determined to run Smash Bros. Ultimate on your computer, the only working method is emulation. Emulators are programs that mimic a console’s hardware so you can play its games.
And on the desktop, a new icon: Super Smash Bros. Ultimate (PC Edition).lnk While there is no official PC version Super Smash Bros
However, as the days went by, John started to feel a little guilty about playing the game on his PC. He knew that the game was meant to be played on the Nintendo Switch, and he wasn't sure if he was doing something wrong by playing it on his PC.
“You tried to download a full game for free,” Clippy said, folding his metallic arms. “It looks like you’re trying to destroy your computer’s soul. Would you like help?” "Download Game Super Smash Bros Ultimate PC Full
Conclusion
If you own a legitimate copy of Super Smash Bros. Ultimate and a Nintendo Switch, you can legally dump your game cartridge to your PC.