I think we're arguing over the word "intelligent". To me, Doctor Who is more intelligent than the writer, Russell T Davies, because (as an example) Davies does not know how to travel in time.
If Davies did know how to travel in time, he could create a more believable time traveller (to the viewer), but it would still be the same Doctor Who character with the same intelligence. (Otherwise Doctor Who's intelligence would increase and decrease depending on who was writing the episode.)
No, we're arguing over the difference between creating a character in a book and what Baron Frankenstein did (had
he not been a character in a book). Great argument, but ultimately extremely silly.
No-one has actually created, or even attempted to create a real person with a superior intellect, called Sherlock Holmes. Nor has anyone argued or suggested this is the case. What has been argued is that Doyle could, and did, create a
fictional character with an intellect superior to his own.
It
can be done. I do it here every day.