Hey, I'm having the same problem with this, also using a Macbook Pro
I have downloaded countless emerald roms and not one has registered, I've been searching for 2 days. Each emerald rom was put into the roms folder but it didn't make a difference. I have heart gold and fire red both in the same folder so i know its in the right place. I've googled 1.0 USA and only found one with the extension, but i still get the "you do no have the required rom.." message from the 2nd port guy in viridian. Has anyone using a mac gotten theirs to work?? If so please let me know how!!!
I hope this gets fixed I want to go to Hoenn so bad :(