respectfully do not dump a capital investment in buying a car, whenever you plan to travel book a car for long term or short term rental, through AVIS or HERTZ with driver fully insured and covered for break downs. That will be hassle & stress free, and very economical. compared to depreciation and wear & tear of a parked car.
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to cross check for buying a used car. if & when you select a used car to buy ask seller to provide you with copy of regn book and visit the Motor vehicle regn office to verify the genunity of car for engine, chassis numbers plus the existing ownership in their records. you can get an update for paid tax (token) as well from motor vehicle regn office (click MTMIS ) Police control ANTI Car lifting cell can help you cross check for car clearance.
To register a car you shall have a CNIC as citizen of Pakistan or a NICOP if you are dual national living outside Pakistan.
For people of other nationalities procedure is entirely different