It is odd to think that a pokemon best known for firing incorporeal ammo spent the better part of five centuries as the biggest threat to castles – not just in Galar, but in Kalos and much of continental Europe. But Dragapult need not be restricted to firing Dreepy – not by the laws of biology, anyway.
It must be admitted that many alternative weapons, including the most creative of the period, are forbidden by the rules of contemporary pokemon battles. A sufficiently anachronistically minded trainer can admittedly resort to launching an Iron Ball, but the Arrokuda (launched with far more force than from a Cramorant) or even specially carved stones that dominated the wars of the period are forbidden. Medieval nobles, however, were not bound by that particular set of rules, and the era's norms of war sanctioned the use of any weapons a Dragapult could launch. No one in the period ever contemplated outlawing them, for without Dragapult and their projectiles, how could wars ever end?
Although medieval Dreepy were denied their place of honor within a Dragapult's horns, no Dragapult would ever battle without satisfaction that their Dreepy were safe and sound. Typically, they rode atop the army's banners, and caring for them was the responsibility of bannermen; they are far too light to do much to a castle's thick, stone walls. But in the open field, Dreepy are fine weapons which can fell multiple knights at once, as many learned the hard way during surprise attacks. Today, they are more likely to finish off wounded pokemon – for even centuries later, there is nowhere to hide from a Dragapult's barrage.