I have really never been able to successfully build a team where I can sweep with Clamperl this 'round', and I've tried giving it various levels of support. The problem is it's just way too hard to set up, and even if you do there are still lots of things that can stop your sweep! It's easy enough to say in team preview "ok I have to take out doduo and maybe that gastly and weaken ferroseed so I can set up on pokemon X (I'm not including a name here because it's that hard for me to think of something off the top of my head that it can safely set up on!)", but not only is that extremely difficult to actually do in the course of a match, I can say the same thing for a ton of other sweepers. Most teams are just too prepared for Clamperl, either because that's how the rest of the metagame just shapes it out, or they are really paranoid of Clamperl. I've honestly had much more success with Omanyte, because there are a lot more things it can set up on, and with Life Orb it's 'strong enough' after a Shell Smash (although it still leaves a bit to be desired I guess...).
---
EDIT: oh, I forgot. I guess people are probably going to respond with how obscenely powerful Clamperl is even before a Shell Smash. I would agree it is, but even so I would say that I've really tried to just spam attacks early game and like everything else about Clamperl, it's easier said than done (unless you have 100% accurate prediction...). You'll probably KO a Pokemon or two at best, but other than that Clamperl is pretty risky to bring out too often early game, just because whatever they bring in to revenge Clamperl will either kill it or force you to switch out and backpedal pretty severely (because it will be something like Staryu or Chinchou or Magnemite or Snover, which are not exactly easy to switch into for all teams). Not that that's really that bad considering you have possibly already just gotten a KO, but there isn't anything particularly broken there either.... idk
---
As for Scraggy, I pretty much feel the same way. It is fairly easy to counter with a small number of Pokemon, and people have been running Scarf Taillow/Doduo (among other things) this entire "round" to check it nicely. I think I can count the number of times I've seen Scraggy sweep (from either myself using it or my opponent) on my hands. People always whine for one reason or another that Pokemon like Scraggy 'force them to run one of X # of Pokemon' (in this case Mienfoo/Shelmet/Koffing/Timburr/etc)... but I have never really had a problem with that (so maybe that's just me?). This has pretty much been the case forever, I'm not sure why it's recently trending that this is suddenly reason to ban stuff. That's not even mentioning, of course, that usually blanket statements like "I have to run Pokemon X, Y, or Z to beat A" are incorrect, as there is occasionally Pokemon W that you overlooked and works equally well. But really, in a tier where maybe only the top 30 Pokemon are common at all, picking 1 ("or 2") of 5-7 that you "have" to use to beat a Pokemon really isn't that bad..... sack up, basically.
BTW, why are people even talking about Head Smash Scraggy? I have not once seen anyone use Head Smash Scraggy that I can think of. It is really not relevant in any discussion, especially considering that the ability to beat your a couple of your counters by running an otherwise inferior move is nothing new, nor does it make a Pokemon "broken". I would say the same for stuff like Zen Headbutt and Taunt, but I've at least seen those a good number of times...
Then again, I have no idea why any of you would listen to how I feel about tiering all considered.... so take any of that with a grain of salt I guess?