To play on PC or other platforms, the safest and legal method is to "dump" your own game files from a physical cartridge or digital purchase you already own. Downloading ROMs from unofficial third-party sites is illegal and carries risks like malware. Legal Ways to Get the Game Files
If you're still interested in downloading a Monster Hunter Generations Ultimate ROM, here are some popular websites:
The Western 3DS release that does not include G-rank or "Ultimate" content. Official Ways to Download The most reliable way to play is via the Nintendo eShop .
Downloading ROMs for Nintendo Switch (or any current or recent console) without owning the original game and dumping it yourself typically violates copyright laws and the platform’s terms of service. Monster Hunter Generations Ultimate is a commercial game developed by Capcom and published by Nintendo in some regions. Distributing or downloading ROMs without authorization is considered piracy.
This is the primary digital storefront. The game frequently goes on massive sales, dropping from its standard $39.99 to as low as $4.99 or $9.99 . You can purchase it directly on the Official Nintendo Store Physical Retailers: