On Mamo: use Thick Fat, much more useful than oblivious and snow cloak, and yes, it is in fact released. I like him otherwise, seems to take out the two most common leads (Gliscor and Tyranitar) which is extremely cute. Just be ready for the predictable protect against Gliscor and use that turn to set up rocks.
On Jelli: I agree with the above poster about Surf v Scald. It seems as though he's your only hard Conkeldurr counter (although you do have others that can come in and just force it out, like Skarm), and if you get unlucky with a Scald burn on him, you're looking at a massive Guts boosted Stone Edge or Payback smacking you around (especially considering you're using a specially defensive spread). The Evs are a bit unconventional, mind explaining them a bit more thorougly? I understand the 48 Speed, as most run 44, but why the 24 Def? What is it saving you from is what I'm asking I guess.
On Thundurus: Keep Lefties. Nasty Plot isn't required, because as you said, he already hits really hard. I agree to an extent about not choosing Timid, but if you do in fact go with modest, you're risking running into a Landorus who will knock you around because of his immunity to T-Wave, and the fact that he outspeeds you. The same holds ture for non-scarfed Chomp variants. If you ask me, it makes HP Ice seem rather useless. I also think that you'll spend that one turn t-waving and you'll get destroyed by stuff like Haxorus and
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On Skarm: Sad that there's no sprite. :< Looks good in my opinion. Great justification for using him.
On Chompy poo: Looks good. Very standard, very scary. Me gusta.
On Swampert: Same as before. He's an effective wall with great synergy to your team, but it seems like your wasting his usefulness with the moveset (Rocks being on Mamo and WW being on Skarm make two of his moves repeats). I would consider adding Scald in over Roar. Unless you don't think Skarm can live long enough to phaze out Excadrill or Conkel, I'd highly suggest it in fact. You may want to consider a rest talk set as well. I'm not sure how well those work anymore though with the whole "trololol sleep mechanic makeover".
As for your overall team, it looks like you've got pretty good synergy. The lack of a rapid spinner doesn't really hurt you that much to be honest.You only have one SR weak pokemon, two spikes/t-spikes immunities and I can't really see a way to fix that problem without screwing with your current synergy. There isn't a very good selection of rapid spinners, which is disappointing, perhaps Starmie could find its way in over Pert? I'm not sure. I'd maybe try that out, although I'm not sure. :x Other than that, I think it looks really good. Time to defeat what you think you have problems with:
- Hydreigon - Well you sorta do. xD I mean Mamo could shard it, although I don't know if that OHKO's before he mauls you with Draco or Fire Blast
- Latios - Ice Shard should deal good damage, but you're right, I can't see many other options for helping that out. Perhaps scarfing Chomp? D; You do lack a chiocer, so I can't imagine that would hurt TOO much.
- Jellicent - Your own jellicent is pretty much anti-jellicent xD. Thundurus beats him as well. Of course the jerk always switches to Ferro to take the T-bolt, so be predicting between what to use. Focus Blast if you smell a Ferro switchin, HP Ice if you think it'll be Latias, etc.
- Skarm - Loses to Thundurus. This is where having Starmie as well might come in handy.
- Breloom - Ice shard if it doesn't have Mach punch, but not sure if that OHKO's and I'm too lazy to do calcs. It probably doesn't, so yeah, you do have a problem here. Chomp might be able to hit hard with Outrage or something.
- Conkel - you really don't. :x You have Jelli, Skarm, and Pert who all can handle him exceptionally well and stop him from bulking up.
- Entry Hazards - Yep, you do, at least to spikes and t-spikes. That's why I suggested Starmie earlier.
Also, sorry for the ugly post. I wrote it in notepad while looking at the first post.