What is Rolex scrambled serial number?

It means that Rolex has changed the pattern of the serial numbers they assign to their watches --its now a random pattern (or a scrambled number). Its nothing that needs to be avoided; all newer Rolex watches have this random serial number pattern.

Do Rolex movements have serial numbers?

Rolex engraves or assigns a 4-6 digit model number to every watch type it produces. This number can be found engraved between the lugs on the side of the case above 12 oclock.

Can I sell a found Rolex?

It is possible to sell a Rolex without the papers, but expect slightly less than for one in the same condition that includes the original papers. Usually a few percents, but other factors such as condition, service history, dial configuration, etc will also affect the value.