Ant Grubb, Seb Huber, Matt Sutherland and Seb Kidd's injury-time winner ensured the bottom side got off the mark, Chris Layne, a Scott Forrester penalty and Lee Messham scoring for Mountain.
Tommy Hallam's hat-trick helped Offa Athletic sweep aside Maesgwyn 7-2, Chris Hewitt (2), Alex Bailey and Lee Bent completing the scoring for the visitors, Mike Dugine and Callum Issac for Maesgwyn.
Rhostyllen saw off Connah's Quay Tigers 3-1 in the Horace Wynne Cup semis, Ollie Allman, Steven Jones and Dean Jones scoring for the victors,Andy Jones for Tigers.
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