@Sector Revenge: To be honest, because I couldn't choose another dragon as my second choice. :P I probably would've chosen Haxorus if I could've. I was honestly torn between Gyarados and Arbok as well, and either Flygon, Latias, or Salamence could've stood on Gyarados' level.
How often do you use Dragon-type Pokemon in battle?
Constantly. I rarely manage to have 0 dragon pokemon on any given team.