Well the consulate know that the PCC isn't worth the paper it is printed on. But nothing prevents you from going and getting one if you are so inclined. I'd be surprised if the consular officer looked at it. It is clearly stated on the Department of State's site that it is worthless.
"Police Certificates
Unavailable
Comments: Pakistan does not have a nationwide system to track criminal activities. Police Character Certificates are available for a fee from District Coordinating Offices. However, they are not an accurate reflection of an individual's criminal record. An applicant who has committed a crime in one district may be able to obtain a clean Character Certificate from that district or another. Given the inaccuracy of these certificates, they are not required for consular processing."
