This will open a save window. Select the save location, name the file, and save this randomized version of the Pokemon ROM. Open the emulator, select the ROM, and enjoy your new random Pokemon ...

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.

Just download the package, unzip it, run the .exe, and then open the File menu and choose Open ROM. Nintendo DS screen at slightly reduced size.