Mario & Luigi: Paper Jam Bros. ROM or CIA files from a website is illegal in most jurisdictions , regardless of whether you own a physical copy of the game. While emulators themselves are generally legal, the act of downloading copyrighted game files from the internet without permission is a violation of copyright law.
If you want to play on a PC, Mac, or Android phone, you need an emulator (like Citra) and a .3ds or decrypted ROM file. mario luigi paper jam bros rom cia download high quality
Select , then choose Build CIA from file or dump it directly as a decrypted .3ds ROM. Mario & Luigi: Paper Jam Bros