Here is a great scraper to use for Emulation Station and RetroPie. It brings back lots of metadata including images and game descriptions. Its also really quick and run from the command line.

This currently works with NES, SNES, MD, GB, GBC, GBA ROMs.
It now support adding the 'Players' in the metadata.

You can find it here:
https://github.com/sselph/scraper/
https://github.com/sselph/scraper/releases