Authentic shiny Polchageist and Sinistcha. These things are impossible to spot in the wild. And I've seen videos where some goes, "Oh that's a shiny."
How?! How do you see that? Is it because it's better to see on your own screen? Nope! I couldn't see a difference when I was hunting and thought about giving up.
Just use the low-level, slow-moving pokeon hunting method. A pokemon won't kill a shiny when in auto battle. Low-level pokemon won't ko your outbreak and slow moving means that you can call it back before it attacks. That way you won't have to waste healing items when it wears itself out if you weren't able to call it back in time.