My luck has been outstanding this generation. In Moon, caught a shiny Poliwag (now a Politoad) while SOSing for Poliwrath/Politoad. It doesn't have Drizzle, but it did have a Modest nature and 4 perfect stats.
Very usable, especially after I bottle cap her. A few days ago, I caught an shiny Adamant Raticate in Sun while trying to catch a Komala. She also doesn't have her hidden ability, and her IVs are pants, but will definitely be usable after a golden bottle cap.
If that weren't enough, I caught Pokerus last night! I know it's easy to get from online trading now, but it was still really cool to see. The only other time I got Pokerus myself was back in Platinum, which I transferred up to Gen 5 and 6.
After I finish the (post-game spoilers)
in Sun, I'll be able to trade over all the Sun exclusives and finish my Alola Dex in Moon. ^-^ Honestly, I'll probably end up finishing my Alola Dex in Sun as well 'cuz I'm crazy like that. xD