For games you do legally own (like an original Pokémon FireRed cartridge), creating a backup ROM for personal use falls into a legal "gray area." Some claim this is protected by fair use as a form of archival backup. However, distributing or downloading that ROM from the internet is still generally considered a violation of copyright. The safest and most ethical approach is to either dump ROM files from your own personal cartridges or to purchase legal re-releases of the games on modern consoles like the Nintendo Switch.