Ever since Yanmega, I've seen in this site a few senior users complaining how there isn't a Dragon/Bug typing for a 'mon. This can also be found on Haxorus' page, where somebody mispredicted Haxorus' typing, to much disappointment. So I ask: why is it special, what does it hit offensively, and what does it resist?
Bug/ Dragon is a unique Typing, to be honest, which in itself is a cool aspect.
Here's why it would be awesome
Access to Quiver Dance: First and foremost, this is a perfect stat boosting moves that a Special Dragon can abuse to perfection.
Great Move pool: The special attack Bug Buzz, along with Draco Meteor and Quiver Dance immediately comes to mind. Apart from that, the Pokemon might have other bug-tricks like Sticky Web, and STAB U-Turn. This last bit is important as we see so many Scouts in the meta-game
Probability to get awesome abilities like CompoundEyes
Helps beat the plethora of Dark and Psychic types in the meta-game
One last thing too: Design. Just imagine, a Centipede or some other cool creepy crawly with the fierceness of a Dragon, maybe even wings, etc. Nightmare material. A lot of people find that cool, too, as well as makes for a good antagonistic Pokemon in the game it is released.