Well, after countless tries, including accidentally stopping an SOS chain with beak blast and finishing a match early to go to bed, I finally caught a shiny yungoos, my first shiny in over two months. I was bound and determined to get one, which wasn't easy because I normally only play at night, and I haven't started Moon yet. I had two days in a row where I started the chain in the morning, closed my working 3DS (I will trade in the broken 2DS I mentioned last week), and left it on the charger in pause mode until I came back from work so I could hunt yungoos well into the evening. Then, of course, I find the shiny on a short chain on a day off in the afternoon, LOL. Well, at least that's it for the time-sensitive hunts for now.
I'll either SOS hunt for growlithe (for my shiny Rocketdex) or cutiefly next, and later I'll get mimikyu (spoilers). I don't think I'll bother chaining mareanie (spoilers) because I've seen on twitch and YouTube that it can be a headache, since it can only be called by corsola and it won't call friends, so I'll wait till I get the shiny charm and I'll MM it.