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.
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Yes. You find zekrom in Pokemon white and the white Pokemon in Pokemon black.
you can't find haunter in Black
How to find the captain on pokemon black2
Celebi isn't available in Pokemon Black and White. You have to transfer it into Pokemon Black and White or trade for one.
You cannot get the TM/HM Whirlpool in Pokemon Black or White.