A ROM in general is .. well the file of the game.
You need to put it on an emulator, like VBA,
or download it on to a cartridge to work it.
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Look for the game on the internet.EX. Pokemon Yellow ROMJust type the game name in and type ROM after it
go to doperoms.com and search it in search bar at the top of the website, then click it and scroll to bottom and it says download.
There are lots of fun pokemon rom hacks, i would recommend pokemon light platinum, pokemon sienna (it's not a finished hack though) and pokemon ash gray :)
no.
Download a SAFE ROM then a Rom reader.