after you beat roark, go left and turn back to Jubilife city. then go up and battle the 2 galactic grunts with dawn(it is a double battle). then keep on going up.you will come to a stop where there are boulders that are only to be cleared with the HM Rock Smash. then keep going up until you reach Floaroama town. turn right and a girl will appear. go more right and then go up. battle he galactic grunt. then go back to Floaroama town. head up to the Floaroama meadow.battle the galactic grunts one by one. then you will get the key to the Valley Windworks. go inside and battle the Commander Mars. then go to Enterna Forest with Cheryl. help her get past.after that you will be in Enterna City.Battle the Gym Leader there.
i have finished the game a million times so i know. hope it helped!:)
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Roark, a Rock-type specializing Gym Leader, can be found in Oreburgh City (just like in Diamond and Pearl).
A hiker, when you enter Mount Coronet in the beginning of the game, gives you the HM rock smash. Outside of battle this will allow you to break rocks. You can't use this until you defeat Roark of the Oreburgh city gym.
You can't battle Roark in HG/SS. If you saw that video on YouTube that giancarlomango11 made, it is all a hack.
Roark's exact age is never given in Pokemon. However according to the anime he might be in his late teens as he was very young when he gave his father a fossil ten years before the events of the anime.
It isn't really all that tough, actually to beat Roark with Piplup. Simply train it to at least level 8-which is when it learns Bubble; a strong move to use against rock types. If you have the time and the patience then you might as well train it to level 12 to 14, which is the level of Roark's pokemon. Have fun. ^.^