So first...
There are a buttload of answers to Clefable and the fact that it is giving you so much trouble just proves you need to sort out your teambuilding. [...]
which is a common misconception that comes from people either not looking hard enough or not playing enough before moaning with their tail between their legs [...]
I've prolly explained very poorly and/or missed something as I'm tired and a little hot-headed, so if someone else could add to this that'd be great.
Attacking my poor team design when you don't know what teams I play, and saying you are worked up over this issue is not exactly a position of strength. I'm not coming here saying Clefable is broken lol just ban it, but already people start with mudslinging. (Given gamer boy's profile messages I put a strike through the last bit, and I'm grateful for him contacting me. However, I do think some of the rest of the first paragraph is endemic to this community as a whole so I'm leaving it as is): I have plenty of options against Clef on my current team - as someone who feels like it's dangerous to the meta would do. It would be nice if for once people couldn't tackle these arguments on face value while being emotionally detached and not just saying, "Git gud". Frankly, it's what bores me about the forums and wants me to wait for next gen - too much naysaying.
Some of your points I will cover in brief: "Clefable isn't S-Rank because of bannings." Yes it is, let any of Mega Mawile, Greninja, Aegislash, Mega Lucario or Lando-I back in the tier. Hoopa-U had a multitude of weaknesses, which meant it was easily counter-able, which meant Clefable was reasonably viable - any one of the others would be a huge knock to its current viability. It definitely,
definitely, isn't S-rank without 4/5 of those key bannings - with even one of those guys back in the tier in wouldn't have the sway it does now.
"Huge variation" in the meta game - really give me replays for this. There's large balance variation, with the recent Slaking team that was successful and others think out of the box - but these teams largely succeed with their unusual options. Give me a "unique" stall team and I'll be pleased, give me even a truly unique HO team and I will be agog. I know there's nothing new under the sun it terms of powerful sets, but there's limiters like Clefable which make the situation a whole lot worse. I know, I know - a stale meta coming towards the end of its life, but still with different banning options we could have seen more variation IMHO.
Sure I didn't count for Flamethrower negating Clefable's options, it was strongly implicit with what I said but I will lay it out for you. The fact Clefable can run it as a meaty lure option and still be a perfectly viable set isn't great. It lures Scizor and Ferrothorn both of which, regardless of their SE moves, can't easily get a 2HKO.
The Clefable mind game is real. Against offense, Unaware Clef players know not to bring their Clefable out against hazards or sandstorm to show their hand - offense will surely pack an answer to Unaware Clef to have any success but obviously that's an entirely different answer to the relatively easy Magic Guard Clef. Clefable players know this, they exploit this - they can easily delimit offense by proxy. Likewise, a Magic Guard Clef can similarly not show its hand and let the opponent believe the player is acting cautious because their set is Unaware - only realising too late their Toxic-stalling chance is now useless. However I guess me and every one else who faces all these delimiting factors and pressures Clefable places on teams even in isolation should just "git gud".
Also the fact you are saying that we need to unban these blatantly broken and/or overcentralsing threats to check it entirely ignores the reason we ban things in the first place. The things which you mentioned were not simply "middlingly powerful" but rather they were so powerful that they literally broke the game, and "broken-checks-broken" is a really, really bad system to follow, and quite frankly it contradicts its own justification because in order to maintain it we would need to keep unbanning broken things to check these slightly-less-broken things until we reach a point where there is nothi g left to unban, and we do not base bans on what the metagame looks like without it, but rather on whether it is healthy for the metagame it is in. If something is broken afterwards, we ban that as well, rinse and repeat until the meta is balanced. Unlike with the unbanning strategy, there is a stopping point before everything is gone, and if anything the ORAS metagame has reached that point now.
Putting a pin in Clefable (which I do nightly as a voodoo ritual to play better in my games) - yes middlingly powerful is how I would describe many of these threats. Hoopa-U - slow speed and obvious weaknesses. Aegislash - slow speed but I can see where the mind games and huge stats become un-palatable. Mega-Mawile - slow speed plus defensive typing plus super effective against other fairies plus priority means bad I guess? Greninja - ultimate versatility yet no bulk, especially against priority - which it also has. Lando-I - a strong hitter with palatable bulk, yeah I guess I can see the ban here too but it wasn't crazy. What I fini surprising is the stall/offense ban ratio - with Deo-D, Gothitelle and M-Sableye being the only noticeable stall bans up for debate this gen.
Other stuff like Mega-Lucario/Salamence offered ridiculously strong worthy bad arguments (can both run mixed sets, the former can boost each mixed set while the latter has great bulk and a spammable STAB) but there's many reasons why the other stuff wasn't (notice I'm leaving out obvious arguments, like instantly bannable psuedo-banded M-Kangaskhan).
I think the community should really reconsider un-banning mons at the phase transition, e.g X/Y to ORAS. Would people have cared about Deo-D banning with M-Sableye? I really don't think so, I think there's too little attention payed to these play shifts.
EDIT 2: As mentioned, gamer boy sent a profile post through apologising for rude responses, being overly heated due to another issue - which was greatly appreciated. However, for prosperity, I keeping the post as is - I still think the mudslinging and unpleasantness around here is pretty much intolerable and the arguments on both sides were pretty valid.