You can't find a zweilous or a hydreigon I either games you have to evolve deinos . Fist at level54 it will evolve to zweilous then like another 10 levels then you got a hydreigon
Chat with our AI personalities
I would choose Hydreigon. It is really powerful.
If you mean hydreigon a dragon type pokemon, then you need to go to victory road and look for a deino lvl it up enough so it will evolve into zweilous and then lvl it up some more and tada, you have yourself a battle ready hydreigon. My hydreigon helped me beat the elite four and the champion.
Guess
Well, Hydreigon is a dragon type, and dragon effects itself, so use a dragon type or any other type about 5 levels over it, but dragon works really well.
Level it up to level 50, then it will evolve into Zweilous. Level it up to level 64, to evolve it into Hydreigon.