Pick from: (a). Try to enter the room with deino at first to do a pokemon swap. However, keep in mind that this is always a win-or at least a victory for the parents of the two monsters that have the highest hp. (b). It's located at 135 upon the 4th floor of main road and it has a 30% of showing up, giving you one hydreigon. When you first defeat deino, you'll notice that he's described as a' subway needle. (c). Carry a pokemon with you that has status-affecting moves such as thunder wave or hypnosis. It would also be wise to have a pokemon who knows the move false swipe. (d). Once this is complete, you won't need to raid again. Go north to the notch fighters' retreat location.Choose from options above and answer: What most naturally follows?

How to get a hydreigon in pokemon black
Go to victory road.
You must first catch a deino, which can be found on the 1st and 3rd floors of victory road by walking, and it has a 20% of showing up. The location of deino is the same in both black and white.
Answer:
(c).