For Dublin there is two shops that I know both in Temple Bar:
Skate City - run buy Clive, this dude is the grandfather of Irish Skating, great guy. Defo pop in for a chat with him. He used to have a shop called Hill Street, there is a documentary about it:
https://youtu.be/vBMRc0rnaHUThere is another shop that used to sell bongs and smaller brands on Cabel Street , but they moved around the corner from Clive...High Rollers Dublin:
https://www.instagram.com/highrollersdublin/Gonna warn you thou, Ireland is expensive expect that in the skateshops also. If it's dry check out Bushy park for transition, and Portobello for ledges, when it rains have a few scoops for me. Enjoy.