That Cobaloin set looks really solid. I can't think of any real improvements off the top of my head and it looks pretty effective. Nicely done. Zangoose certainly looks interesting but I'm curious as to why it hasn't been used if it has so much power. I suspect it's downfall comes down to its speed and and lack of bulk. It can't really take any of the powerful priority moves being thrown around in OU, and even a STAB, toxic-boosted Quick Attack is still weaker than CB Dragonite's ES, meaning it won't OHKO a lot of threats like Scizor's bullet punch and Brelooms Mach Punch will. That'd make it very prone to being revenge killed. Remember it also needs a turn in which for Toxic Orb to activate too, meaning it'll initially be fairly weak. Still it's an interesting concept I haven't seen explored too much and it probably deserves a closer look. I think that Lanturn can indeed function well in OU with a Rest-Talk set. However, I don't think that running Volt-Switch on it is a very good idea because it means that once it goes to sleep it probably won't be waking up again. Because 33% of the time it'll draw Volt-Switch when asleep, it means your sleep counter will almost never expire, making Rest sort of a 1 time recovery, which isn't really a good thing. Instead I recommend running Thunderbolt or Discharge. Volt-Switch is cool and all but it goes together with Rest-Talk about as well as ketchup and peanut butter do. That Chansey looks like a really good idea and it certainly looks like it can help Chansey get past a lot of its checks. However most of the Pokemon it beats are stall oriented, which is something to keep in mind when thinking about using Skill Swap. If your team has more trouble with offensive threats Thunder Wave might still be the better option. That Gothitelle on the other hand just doesn't look like it'll work very well at all. Without defensive investment it won't find it easy to set up against much of anything, even with the aid of a scarf. And that scarf might not be much aid at all remember; the opponent is likely to use their move which is most effective against Gothitelle first, and that'll be what they get locked into against you making it challenging to set up. Due to Gothitelle's lack of resistances it's going to find very few Pokemon it can set up on in the first place. And even if you do set up, the reward is rather lackluster. Gothitelle's 95 SpA isn't going to win any awards even boosted as high as +4, and with barely any coverage due to being restricted to two slots, you'll still find many special walls walling you. Not to mention that any faster physical attacker will eat it for breakfast if you don't trick back the scarf, and if you do you lose ALL your ability to use coverage moves, making you even easier to wall. Overall it just seems like an inferior option to other CM users and a waste of Gothitelle's potential.