Yea ... I could see Dragons with a HIGH intelligence, caveat being it has a "Solitary" AI protocol.
Of course, you could make the occasional Dragon to raise "fiend armies" like the Arch Demon in Dragon Age 
Such a dragon would probably be younger "juvenile or newly Mature" and be part of one of the more hot-blooded, powerhungry races (in DnD terms most likely a Red Dragon or Green dragon ... or at the opposite side of the alignment coin a Brass or Copper Dragon)
such dragons could probably be considered their own faction, or a "Minor Sovereign" with the ability to have resources, own cities, hire mercenary armies (of humans) and of course intimidate animals, monsters, and minor demons to work for them.