Many dictatorships actually do. The question is more like "is it a process that only exists on paper?". If an election ends with a 98% approval of the supreme leader (or whatever the designation), then it's probably rigged and just for show...
To give an example Italy had an election with 98.5% for the fascist party in 1929. That was to confirm or reject the list of house members appointed by the party. I mean, there were no candidates to chose from, the ones in the list would be... elected?
