Well I noticed quite late but Pokemon FireRed Version is only available on Switch eShop and I put it under Nintendo Switch so I don't know if you want to merge the listings or delete one. The latter is mainly if I remember correctly for the physical releases. LeafGreen Version should also be the same.
If a game has no box art or never had packaging, then why not move the cart to the front art? I'm sick of seeing "No Art" on the listings.
If the item has no outer packaging (pack-in items, unofficial releases, bootleg/homebrew games, merchandise, console accessories or controllers (without a separate retail release), the image of the loose item can be placed as Front Art/Image. Leave Back Art and Card Art images blank.