Download Pokemon Sun (eu) | 3ds File | 3.1g -

Since digital purchases are no longer available, the primary legal way to play is through physical retail copies:

You can no longer purchase digital copies of Pokémon Sun directly from the official store. Download Pokemon Sun (EU) | 3DS File | 3.1G

Downloading unauthorized "3DS files" or ROMs from unofficial third-party sites is illegal and carries risks. Historically, Nintendo has issued permanent hardware bans to users caught using pirated copies of Pokémon Sun online, which blocks the console from all Nintendo network services, including the eShop and online play. Legitimate Ways to Play Pokémon Sun Since digital purchases are no longer available, the