The Pontypridd pivot crossed for a remarkable four tries and converted four of the nine tries in a superb all-round individual performance.
"Sunday's game was a fitting culmination to a long season," said Richard Hodges, WRU Performance Manager for the Blues.
"A lot of people put a lot of hard work in and it was good to see that rewarded. We've used our resources throughout the tournament - we had a full strength side out yesterday and we have been lucky with injuries.
"But we produced a good performance and played a great style of rugby which was good to see.
"A lot of this side will go on to further things now. Some will play Principality Premiership rugby and we've got 11 boys in the Wales Under 18 side. Hopefully they will transfer this success on to the next level."
The Blues never looked like letting the Dragons take home the title with left wing Ellis Wyn Benham opening the scoring after just a couple of minutes. Arwel Robson responded with a penalty for the Dragons but Evans converted the first of his own scores as the Blues pulled clear.
Jordan Viggers, Hemi Barnes and a second from Benham extended the advantage to 29-3 before the Dragons got their first try of the day.
Lock Ben Watts dived over with Robson converting but it only served to shake the Blues up once more.
Evans added three more scores of his own to cap a remarkable day with Lloyd Lewis' effort a mere consolation for the Dragons.