All my posts in this thread have been made in my role as the project moderator. This post is just my opinions as a member of the CAP community.
I like the following concepts because I think they would add the most value to the current metagame. These are concepts that I think are "needed" in the game:
Deck Knight's "Rapid Spinner" & Jagged Angel's "Entry Hazards"
There is a bit of overlap between these two concepts, so I've lumped them together. It's undeniable that entry hazards are a dominant force in the metagame. I think TOO dominant. It would add a lot to the metagame if we made a pokemon that could handle entry hazards well.
X-Act's "Garchomp Counter"
If we could do it, it would be great. I truly despise the centralizing influence Garchomp has on team-building and battle strategy. If we could make a near-perfect counter, it would be fantastic. Anyone that was around during the Syclant project knows that I argued vociferously for Syclant to be a Garchomp counter. Alas, it didn't happen. At best, Syclant is only a solid Garchomp revenge-killer.
Dane's "Haze-Ablaze"
With all the setup threats in the current metagame, there are very few good phazers and even fewer (none, really) usable hazers.
Gothic Togekiss' "Reversal of Worlds"
The concept name isn't a good indicator of the role. But, anything that can be a great status counter gets a "thumbs up" from me. I'm sick of slapping RestTalk on various pokemon on my team, just so I can handle status. Natural Cure is OK, but not great. Clefable is OK, but not really OU material. It's getting boring. I wish there were more legitimate alternatives for countering status.
The following concepts are not really "needed" in the current metagame, but they would add something good to the game, and they would be fun to build:
Shiny Noctowl's "Ultimate Baton Passer"
SN has been pissing me off with the flood of shitty concepts -- but this one is a good idea. BP is a cool strategy, but there are too few pokemon that can actually help pull it off. The biggest problem is that most Baton Passer's can't really do anything else. The minute they appear on the battle field, it's obvious what is about to happen, and therefore easy to counter. It would be fun to discuss the various ways to construct a new pokemon to utilize Baton Pass. SN's latest rewording of the description still sucks though. "Ultimate Baton Passer" says it all, really....
Maniacalyrasist's "Toxicroak/Stallrain of Sand"
Sand is already an entrenched part of the metagame. It would be interesting to have a pokemon that can take advantage of sand differently than the existing sand team standards.
Magmortified's "Utility Pokemon"
Building this pokemon could be great fun to discuss. We also could fail miserably, considering the subtleties required to allow this to walk the fine line between useless and overpowered.
Dane's "Great Lead Poke"
I didn't realize it when I typed the phrase in an earlier post, but when Dane latched onto the idea, it really struck me. We talk about good leads all the time. Lead usage is specifically tracked on the Shoddy usage statistics. Everyone has different opinions on what makes a good lead. This concept leaves TONS of room for interpretation, but could be a fantastic focusing influence on the rest of the process.