@ghani.ehtesham sir if somehow you manage to get hold of a complete motorbike or a vehicle in parts (KIT) form to build up a vehicle / bike, you will not be able to register it for local urban use.
otherwise there are plenty of smugglers in KPK / Baluchistan border belt areas who can source a bike / motor vehicle of any make model from anywhere on globe and deliver to your door step against an agreed price.
issue remains the legal status to register and use in urban areas,