Full back Hallam Amos scored the only try of the match for the Dragons.
Newport Gwent Dragons Under 18s fended off the challenge from the Scarlets at Rodney Parade to advance to the final of the Regional Competition final.
In a keenly contested encounter, the home side ran out 8-6 victors with full back Hallam Amos scoring the only try of the match mid way through the second half to edge his side in front after the Scarlets had banged over two penalties to nose ahead after Dragons fly half Ethan Davies responded with a first half penalty.
The Dragons will now take on Cardiff Blues in the Regional Competiton final on Wednesday 18 January, at St Helens (KO 7.30pm).
A special video package as Pontypridd claimed the double for the first time in their history by winning the Principality Premiership final, including match build-up, highlights, post match reaction and dressing room celebrations.