Ahh,I'm gonna point out once again that the legal matters depend on the laws your country has and since the laws generally differ at each country you can't be certain of what is legitimate and what not.That's mainly for the posession of roms.
Emulators are legal in most(if not all-I can't be certain of that) countries because they do not "use" any copyrighted material.Only the games ,names etc of a console are copyrighted ,the code of the emulator is irrelevant to them.So if you have any legal questions it would be better to ask a lawyer in your country and not here.