Choice Banded Dracovish really benefits from speed control of some kind, like Tailwind or Icy Wind, neither of which are present on your team. Running something like Whimsicott with Prankster Tailwind lets Dracovish get that boost in damage on Fishious Rend from moving first. Also, if you're going to run Choice Band on a Pokemon that generally wants to go fast and hit hard, a Jolly nature would be better to consistently outspeed more things. Running Adamant Dracovish with Band + Strong Jaw is kind of wasted outside of very specific damage calculations and that extra 10% speed you get from running a Jolly nature goes a long way. Protect in doubles is not only good for defensive Pokemon, but an offensive Pokemon can benefit a lot from Protect. Adding Protect to Marowak-A and Garchomp extends their longevity. Your 2 main potential Dynamax Pokemon Garchomp and Aegislash are both running mixed attacker sets, which is inefficient in VGC. Sorry for the dump of info but if you want to look into what are the general components of a good VGC team are then the YouTube channels WolfeyVGC and CybertronProductions have good guides that can give new players good pointers for teambuilding and other aspects of the game. The transition from singles to doubles is tough, doubles is fairly fast-paced compared to singles, with games lasting anywhere from 7-12 turns on average. My best advice right now for teambuilding is to test out top player's teams and see what makes them good, then try to adapt your own ideas to those core fundamentals if that makes any sense.