ROMs are illegal, which is why PC does not allow them to be shared or uploaded here. However, it is fine to share .ips patches here.
The rules: "Do not distribute illegal content. (4 pts / 4 mths)
The community does not allow discussion of illegal materials - this includes the unauthorized distribution of TV shows, movies, video games (including video game disc or ROM images), music, or software. You may not discuss how to obtain these materials, upload them to the PokéCommunity, or link to other web sites containing these materials."