Hello Pssssssssssh! (erm the nick... whatever)
I'm the main admin on sunbug.net, and my name is Vulpix - Sunbug.net is the site of the developer of PocketGBA.
www.sunbug.net
You will get your questions answerred there - please register there and read everything.
Sorry to tell you, but you probably have the lastest version which has a code-leak in it. It will not be able to load pokemon roms. If you want a version which runs them, contact me via sunbug.net's PM system. Thank you.
Yours sincerely,
Vulpix