You would probably have to research which programs have PGY2 (oftentimes it’s only listed on their websites) and contact the program director directly. Some directors do post openings on this forum though
I’m not aware of any states requiring 2 years GPR experience. I posted for my friend who is applying to Peds this cycle and SDN account was rejected for some reason. But I would assume people who want to apply for specialty programs would choose to do a PGY-2, internship, or fellowship instead of having to look for a job for one year. Of course, that is assuming they match.