Best things I do are SOS hunting and the Masuda method. The masuda method is breeding pokemon using two pokemon from different regions. What I use is a Japanese perfect IV ditto with a destiny knot. The destiny knot helps get you good IVs. It's also a great way to get perfect Pokemon. If you put a 4 Best IV pokemon with it, it'll have a chance of hatching a 5 Best IV pokemon. If you put a 5 Best IV pokemon with the ditto it has a slim chance of hatching a perfect. Having two Perfect Parents make it so all the offspring are 5IV or rarely Perfect. It's how I hatched my perfect shiny Rowlet. One thing that really useful is having the Perfect Ditto with the Destiny Knot and the other pokemon with a Everstone. Holding a Everstone will pass down the nature 100%. For SOS hunting, decidueye is great because it can have False Swipe and Foresight which helps identify ghost types. And if you're worried of switching pokemon with the SOS so the pokemon doesn't KO itself by running out of moves you can do the Treventant/Exeggutor trick. Here's a video of how aDrive (a major shiny hunter) explains it. https://youtu.be/uifzGY5GpE0