you can generate them easily,
however if you want to use apple advanced replacement trick, you will need original ones with AppleCare Protection. You can hack databases, or phish for them on eBay. or you can just buy from Yoshimo
yeah i know how to do the method lol i just hate having to buy the serial and imei. but im going to pay a good amount to find a way to generate them as i dont know how to.