Name: Ultimate Stop
General Description: A Pokemon that, while not necessarily being a top metagame threat, posses as a very imposing hurdle to overcome for many general strategies. Ideally, it would not be an overly-dominant force by itself, and not be able to setup its own win condition.
Justification: Have you ever found that perfect moment to setup with Scizor, getting 2 or 3 boosts from Swords Dance only to remember your opponent has a Rotom-W with a 4x resistance to Bullet Punch, and you find out the hard way it's packing HP Fire? That "Oh crud" moment is what this concept is trying to replicate.
There are so many potentially lethal setup strategies in BW, it's become near impossible to check them all. This concept will be to help people salvage themselves in those desperate situations.
Questions To Be Answered: How valuable is a stop all check to a team, relative to members who actually help push/progress the overall team strategy? In BW's high-offense/setup meta, I'm guessing the value of a 1-stop-check has risen greatly, even if said Pokemon does not have great ability to sweep/stall setup itself.
Explanation: Whether it be stall, defensive boosting, substitute backed sweeps, Landlos' RP sweep, Doryuuzu's SD Balloon Sweep, Rankurusu, etc. etc., there are so many lethal setups that people can use in BW, and it's near impossible to cover them all. The goal of this concept will be to stand as a huge road block to the majority of setups-- this should include most stat-uppers, and should ideally include being a threat to stall as well as immediately fast/powerful pokemon like Landlos, Excadrill, SpecsLatios and ScarfChomp. If it can do things like break past substitutes, destroy barriers, and smash through defensive boosts, even better.
To summarize: Rather than a Pokemon that kicks ass and takes the initiative and can take advantage of a good situation, let's try building a Pokemon that can save your ass in any number of bad situations.