Post your theories/headcanon/ideas about ancient pokemon history. Not the recent stuff like the invention of pokeballs or whatever, im talking about truly ancient stuff. 500 to 20,000 years ago stuff. I'll start :

The civilization that AZ's country was at war with was Pokelantis, and the activation of the Ultimate Weapon is what caused that civilization to end. This is during the pokemon equivalent to the Bronze Age, and thus most of the soliders used the shells, hides, and scales of steel type pokemon as their armor and weapons, as it was better than bronze.