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You can't battle Roark in HG/SS. If you saw that video on YouTube that giancarlomango11 made, it is all a hack.
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. ^.^
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.
Alice
In Jubilife city (Acsessed after defeating Roark) or on the net on pokemon.com and look for the Global Trade Station and that is GTS.