I’ve been trying to find an omega ruby rom for a bit of time, I was hoping anyone could give me a website to download it
If you want to download the game the Nintendo e-Shop is where you can find it. Any download from “a website” is obviosuly illegal and not supported by Citra.
Buy the game and dump it on your 3DS, it’s relatively easy. Just follow one of these guides
3DS cartridges can be bought really cheap second hand. No need to pirate and harm the developers.