What is the greatest possibility for a Pakistani to add me to WeChat?

The biggest possibility is to make friends. The most likely reason for a Pakistani to add you to WeChat is to establish contact with you and make friends. But there may also be other purposes, such as selling products, fraud, false recruitment and so on. When accepting strangers and Friend Request, I suggest that you should be vigilant, carefully judge each other's real purpose and pay attention to personal privacy. It is suggested that you should not disclose personal information and materials at will, trust each other's promises and temptations, and avoid being deceived.