>>20461373Well, Dragon and Fairy are a bit redundant alongside eachother. Fairy has excellent coverage, and Earthquake pairs with it quite nicely, leaving only some airborne Fire, Poison, and Steel types undented (and Shedinja).
Cotton Guard is sweet and will likely see some use, but many Pokemon have run successful Bulky DD sets. Invest in bulk enough to provide survivability and invest enough in offense to take out relevant benchmarks. That depends on stats and threats, but it can usually be balanced into a lovely Boost&Roost set. With Pixilate Return on the front lines and good natural bulk, Altaria is looking promising in that department. Until the game arrives we can only theorymon.