I didn't go too in depth in my first post so here goes!
liengodf8 just brought this to my attention, but Fairy-typing on Cottonee is
really cool in my opinion. Cottonee now checks a lot of offensive threats, including Mienfoo, Timburr, Scraggy, and Carvanha. The Grass-typing is kind of bad now because it can't check things like Murkrow and Houndour better, but Prankster + Fairy-typing could really make Cottonee viable as a big team supporter. SubSeed is shit in my opinion but Cottonee also gets Taunt, Encore, Stun Spore, Substitute, Knock Off, Charm, and Tickle. I might sound like I'm hyping this thing up to be the next S Rank mon, which I'm not trying to do nor do I think it will be S-rank, but Cottonee with Fairy-typing is a cool thing to think about.
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I know these guys aren't related in terms of evolutions but they have the same typing. Phantump is a lot more offensive and has Natural Cure, which is interesting so you can switch it in on stuff like Foongus and Shroomish and laugh in their face. Phantom Force is a nice move once in awhile. Pumpkaboo has great defensive typing and a huge movepool, so it can actually run a lot of different sets and get some cool coverage. The problem with these guys is they don't have any reliable recovery (according to Serebii), so that kind of brings their usability down when compared to things like Foongus and Misdreavus.
Skiddo looks mediocre to Foongus and Shroomish, but it has four cool things (among other things) they don't; Sap Sipper, Milk Drink, Bulk Up, and Horn Leech. Sap Sipper is nifty and lets Skiddo check other Grass types. Milk Drink + Bulk Up + Horn Leech is fantastic in my opinion and although Grass is a mediocre offensive typing most of the time but Skiddo can probably pull it off because of Horn Leech's utility and the other offensive moves it gets (Wild Charge, Bulldoze, Brick Break, Payback, Rock Slide). Horn Leech and Milk Drink on the same set could be redundant but Skiddo also gets Leaf Blade.
Honedge has a really nice typing and double boosting in Automize and Swords Dance. It sucks that No Guard isn't really useful to Honedge but it actually has a pretty decent offensive movepool and Shadow Sneak.
Binacle is going to wreck. Tough Claws + Shell Smash + an amazing offensive movepool is going to make Binacle so good. The only thing it doesn't have going for it is being revenged by priority and Razor Shell with that 95% accuracy.
Spritzee will probably become a pretty good Fighting-check (Scraggy, Mienfoo, and Timburr) because it actually has pretty good defenses and Draining Kiss / Moonblast. I could totally see a CM Set also just because it can set up on a lot of things, specifically Timburr and Scraggy.
I'll probably edit more, I'm tired and I don't even have XY nor have I done much research on the new stuff besides this so I should have more to say later on.