I know that as a DM I can make my monsters do whatever, but I want to use the book as a guideline for most things. I took a Young Adult Pyroclastic Dragon (Draconomicon), advanced it 2HD and gave it an Elite Array setup. The resulting CR is, supposedly, 14, but I think that's really low. In any case, here's what I have for him. You can probably figure out the rest except skill ranks from this:
HP: 289; HD: 21
Ability Scores: Str 35, Dex 10, Con 24, Int 16, Wis 12, Cha 18
~35k gold for magic items
Feats: Improved Initiative, Snatch, Improved Snatch, Flyby Attack, Power Attack, Multiattack, Knock-Down, Superior Initiative
Look good?