Not to rain on your parade or anything but I totally suggested "Defensive Characteristic" which was a more focused version of yours all the way back in CAP11, the idea is hardly a new one
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Anyway if I had to pick concepts that I would slate these would probably be somewhere around the top:
ohgeedubs (Outclassed) - I don't know why but for some reason I really really like this concept, it seems to offer an opportunity both for looking at opportunity cost and the possibility of looking at the effect of doubling up with its Mega counterpart. It would be especially good if it paired well with one Mega while being outclassed by another, hence opportunity cost, while at the same time being a good partner to the Mega that outclasses it for sake of overpowering their shared counters. Altogether a very solid concept - I would simply add that, perhaps you might consider changing the name, since as DLC already noted, it seems to emphasise a less important part of the concept, or rather calls to mind themes that are not shared by your concept.
senshidenshi (Movin' Out) - I like the idea of a good Fell Stinger 'mon. All joking aside, there are a lot of good weaker moves and while I'm not a fan of the "make this move work" style concepts in general, I do like the idea of a Pokemon centred around a variety of weaker moves, in some respect, and I can see a fair window for discussion on how this could be achieved. I wouldn't say it's my favourite of the bunch but it certainly has my attention, provided that it is specified that this is many low-power moves, not just a single one to be decided later.
TorterraX (Predictable Me?) - I do actually like this one, and I disagree with DLC that it is impossible to pull off. Stop me if I have misunderstood your concept, but it seems to me that, rather than this being a generic lure Pokemon, this is one that possesses a number of attacks that can be used repeatedly to little effect and places the expectation in the opponent's mind that the Pokemon will continue to do the same, then when it changes the pattern it is unexpected, rather like Rotom-W suddenly switching from Volt Switch to Hydro Pump to catch out something. My gripe here is that it may be hard to create a Pokemon where this tactic is both consistently successful and also better than the alternatives of just continuing to do what it was doing previously - Rotom-W, for example, doesn't tend to spam Volt Switch as its every single move as far as I am aware.
Qwilphish (Not Vary Riksy) - I'm intrigued by the idea of "little risk to put on a team" because that certainly doesn't seem to be something that exists at present - as far as opportunity cost is concerned, the only things that have no risk to being put on a team would be those that are exceptionally good on any team, as you say. Yet, in this case, the low risk is intrinsically connected to the high reward output - if it wasn't low-risk, the returns would not be perceived as so great. An offensive Pokemon, then, in this case tends to be judged by how often it succeeds, and as such, if a Pokemon fails more often than not, its perceived risk increases. Because of this, I feel that this could only be accomplished through a defensive or support Pokemon that pushes a single job of middling returns but which is consistently useful and hard to stop doing its job. Even so, I'd be happy to be proven wrong on that last point.
TheTraininator (The Pacifist) - White Mage Girls are fun, and this concept is fun. A Pokemon that is entirely given to supporting its team would certainly be an interesting end product and one that I'm sure we'd all enjoy making. More importantly, it's something that doesn't really exist at present and gives us an excuse to think a bit more about the nature of support and how it can be made consistently viable. I'd want to ask, would moves such as Toxic and Will-O-Wisp be considered as eligible on such a Pokemon? I would have imagined not, but I'm not certain of your thoughts on this.
Lasagne (Parting Shot Pivot) - As a general rule I am given to loathe concepts centring around a single move, as I mentioned earlier. Even so, I like this concept because Parting Shot, as a move, absolutely fascinates me. It's a pivot, and it's making use of a move that essentially guarantees a free switch (or relatively free switch) for its teammate at the expense of not damaging the Pokemon that comes in. I can't help but feel excited about what could potentially be done with a move that, really, simply has no way of ever seeing light in OU otherwise.
Agile Turtle (Pivot Predator) - Zzz anti-pivot concepts. We've had a lot of them, but they seem to be exceptionally popular this CAP for some reason. No idea why. As DLC mentioned, the problem with such a concept is that there is a real difficulty in implementation, since there's no real way to actually threaten all of the various different OU switchers - at least one will have some means to fight back, and the very concept of pivoting prevents them from being trapped by any traditional means. As far as this particular concept goes, I like it better than some of the others because it focuses a tad more on the momentum aspect, in that being able to win back momentum even given, or especially in, the presence of a pivot unit would be an interesting way of bypassing the "all-encompassing counter" problem. I can think of a few ways this could be done.
wh0sy0urpapa (Banned for Spam) - Again, similarly to the above, "easily spammable moves" have a diverse array of users and it would be next to impossible to create a Pokemon capable of taking them all on at the same time. On the other hand, hey, if a means could be found it would be an immensely fun concept to try out, and the discussions it could provoke would probably be worth the time. So yeah, including this one for discussion, not entirely convinced it's feasible. You should really provide some examples of how you would go about approaching this concept in the "Explanation" section, since at present it seems cluttered with a treatise on how nice such a Pokemon, if it existed, would be good for the metagame, which is nice but does not address the biggest hole in the argument. If you can address this I'd be much more inclined to support it.