When its attack reaches 72.
at level 50
lvl 64
YES at level 41/42
I believe at level 41 but it might be 42
hydreigon at level 64
Dieno evolves into Zweilous starting at level 50 and then into Hydreigon starting at level 64.
Deino will evolve once it reaches Level 50.
dieno evolves at level 50
you can get one at victory road
You will have to wait until more information is put out for that answer. You could also keep lvling your Dieno until it evolves. Pokemon White & Black is a relatively new game... I'm sorry I couldn't give you an answer.
Sealeo will evolve at level 50 to Walrein.
Have a 60% link with haunter or Gengar