It is a very specific legal issue for PokeCommunity as ROMs are derived from commercial products (ie Nintendo wants you to buy the games) and are seen as a breach of their Intellectual Property. In order to avoid any complications or legal actions, PokeCommunity won't allow anybody to provide link to ROMs or direct others where to download them, despite our large hacking community. You are able to talk about how to edit ROMs/ showcase designs through a patch system, but that's as far as the Higher Staff will allow us to go.
Here is a FAQ excerpt from Nintendo's website just for reference: