Joshua Randall said:
Is it really a dragon? If it's not, then I am going to be really angry. Our very first commune question was: Q: Is (name of creature) a red dragon? A: Yes. That was the only straight^H^H^H^H^H^H^H^H direct answer we've received.
Setting aside questions about DM vs. Players, it sounds like your group isn't asking the right questions. So, back to basics...
You know that X is a red dragon. You know that your other questions didn't net any useful info:
1. (if you know about when the dragon is going to attack) Is X, the red dragon, going to attack this town/city on approximately yyyy date? (We'll assume YES for the next questions, since if the answer's NO, you've been had.)
2. Is X, the red dragon, the only creature that's going to attack the town on that day?
3. Does X posses powerful magical devices, requiring a caster of at least 14th level to create, that X intends to use in the attack? (If YES, you are in serious trouble.)
4. Is X going to start attacking the town/city by air on that date? (This allows you to plan for his alpha strike.)
5. Does X have a way of spying on us? (If YES, adjust your plans, and remaining questions, accordingly.)
6. Is there some device, feature, or characterstic of the town/city that will give us an advantage in the fight?
7. Does X have some other vulnerability besides the ones that are normal to a dragon of X's type?
8. Are there any other allies that we can recruit to help us fight X on the date X attacks the town?
9. Is there something particular in the town that X wants to acquire or destroy?
10. Can X easily detect illusions such as Permanent Image? (Always good for laughs when the dragon flies into an illusion-covered tower.)
Other questions will depend on the answers to these, but you may want to cover some of these additional areas:
* Does X have any allies that will actively assist X during the attack?
* Are any of the creatures in the town working for X?
* Are any of the creatures/people we've recruited to help us planning on betraying us before or during the attack?
* Will X approach from the north/south/east/west?
This should give you a better idea of what you're up against. And since some of the questions deal with the dragon's future actions, current plans, or abilities, you've got a better chance of getting around whatever it is that's blocking/confusing the other divinations.
Other tactics: Find a nice, dark, small room and scry on the dragon via crystal ball. If it fails, you're zeroing in on his divination defense (likely Mind Blank if it resists everything to this point). If its divination defense is that powerful, it's time to retreat and fight again another day. It's not that you can't fight the dragon and win - you might be able to. But your chances later on, after you've had a chance to do info gathering (magical and mundane), scouting, and library research with appropriate knowledge skills (it's a rare dragon that gets big enough to destroy a town/city and doesn't get written about).
Lesser Planar Ally/Binding with an air elemental = excellent early warning system, scout, snatched PC rescue, and/or surprise attack. If you're willing to lose the creature, it may be able to scout out the dragon's lair for you (or tell you where it is if you don't know).
Speak with animals/dead/plants: The animals and plants might know where the dragon's lair is (or that it always comes in from the north). If someone's been killed by the dragon before, and buried in the town, the corpse might have useful info.
Hope this helps!