To play on your PC for free, you must use a Nintendo 3DS emulator. Since there is no official PC version of the game, emulation is the only way to run it on modern Windows or Mac systems. Required Tools for PC Play

: You can use tools like PKHeX to manage your save files, transfer Pokémon between generations, or back up your progress on your PC.

: Open Citra, click "File," then "Load File," and select your Pokémon Ultra Sun ROM.

: Visit the Official Citra Website to download the installer for your operating system.

Even on an emulator, you can still access some "free" content and management tools:

: The most popular and reliable choice is the Citra Emulator . It allows you to play 3DS games with enhanced features like higher resolutions (up to 4K), custom textures, and stable frame rates.

: To ensure the best performance, set the renderer to OpenGL and adjust the Internal Resolution (e.g., 1080p) to remove "jaggies" and improve visual quality.

: You start with 8 boxes, but you can unlock more by placing at least one Pokémon in every available box and logging out of the PC system.