This is a crucial ethical and legal point. All patches and guides explicitly state that you must own a genuine copy of the Japanese game. As one patch developer writes, "Our patch is only intended for users that own the original japanese version of the game".
Modern Switch emulation allows the game to run at native 4K resolutions, providing smooth 60 frames-per-second gameplay that surpasses the original hardware capabilities. High-Fidelity Textures and Modding monster hunter xx double cross japancia google extra quality
Buy a physical Japanese cartridge from Amazon Japan or Play-Asia. Pop it into a non-Japanese Switch. (Switch is region-free). However, you cannot download DLC without a Japanese Nintendo eShop account. This is standard quality (720p handheld / 1080p docked). This is a crucial ethical and legal point
(MHXX) is the original Japanese version of what was later released in the West as Monster Hunter Generations Ultimate Platform Availability : It was released in Japan for the Nintendo 3DS and later ported to the Nintendo Switch Language Barrier Modern Switch emulation allows the game to run
When a NeoGAF user asked why they loved emulation, one reply sums up the philosophy perfectly: "Not to pirate shit. But to make games you already own and played BETTER". The "extra quality" of Monster Hunter XX is a testament to that spirit.