Once it opens, the top right will have a button that says 'Open ROM.' This is where players will be able to select the specific Pokemon game ROM to use. The File Explorer window will open.

You must put their ROM files into your gadget. MakeUseOf recommends using a cartridge dumper like Epilogue’s GB Operator to extract ROM files from game cartridges legally.

To add community translations to a retro ROM, download a patch file, find a patch tool and use it to add a patch to the Retro ROM. Details here.