http://www.smogon.com/bw/pokemon/hydreigon/vgc2012 There is the best write up for him and if you click over to the OU tab there are a few more setups to consider. Every pokemon has its own page with write ups that provide not only stats, but preferred/common set ups, as well as the reasoning behind it, and what to look out for. You say he can die fast? Is there a certain move/pokemon that you've seen be extremely effective against him? There are a wide variety of options to consider, especailly how you EV train him, and what item you give him to hold. Also, what kind of team are you considering him for? Goodstuff, trickroom, other? All this information can really help you narrow down if he is right for your needs, and let the good people of the forum give you the most accurate advice!