I want to talk a bit about Clefable and his presence in the current metagame. First of all, i have not read the posts that comes before myself because my limited free time unables me to do it.
So, i think it's not necesary to say all that we already know about WishPort Clefable, it has been talked a lot (I assume). But I definitely think that people is sleeping on other Clefable sets, aka any version such as CM flame moonblast softboiled Clef, wich is incredibly good against the current balance teams (it's able to break Seismi-Ferro-opp Clef, Corvi and Hippo too).
While people tend to prefer using WishPort Clef in order to keep the bulky sweepers healthy for more rounds, wich is really good (WishPort is the best set rn), there isn't any bulky sweeper with the capacity to break all the current fat mons (just Dracovish in Rain Dance, wich requires a determinate play style -rain or semi rain wich I think that works too-) this metagame is experimenting, while CM Clef can beat most of them.
It's important to considerer that making a game plan involving CM Clef to do the maximun work as possible, you can take advantage from your opponent expecting classic WishPort Clef. This set can be leftis or LO, but the superior version is clearly Life Orb righ now, because opposit Clef, Corvi, Hippo, Ferro, Seismitoad... will auto lose againts CM LO Clef. As I said above, flamethrower + moonblast is rn a scary combo.
Anyway, at creating a team with this set, you are sacrificing the defensive utility of this mon. However, the offensive power againts the current trends makes it worth using and it would be a part of your offensive backbone, and the deffensive backbone has still a plenty of possibilities to cover the metagame while abusing this Clef set.
This set had a lot of usage in early SS, and now with a more balance metagame I expect people to realize CM Clef potential. I need to end this post clarifying that classic 3+3 teams in SS (aka 3 bulky attacker or potentially sweepers + 3 fat mons, one being WishPort Clef always) will keep being the best archetype at least untill DLC comes out, so CM Clef will still be opaqued by WishPort Clef, although it deserves a mention as a great option.