Oh baby. Yeah, there is an amazing Dragon type pokemon in HG/SS. The one, the only, the original & best.. Dragonite! He has fantastic stats, a wonderful and diverse movepool, and he looks so cool! :3 You can find his first evolution, Dratini, while surfing in Dragon's Den, near Blackthorn City. If you answer all of the old man's questions with compassionate answers, you can even get one with the exclusive move Extremespeed! He finally evolves into Dragonite at level 55. A good ingame moveset for him would be:
Hope I helped :D