Let's see, either make another new pokemon, or create an evolution... On the one hand, if we evolve a pre-existing pokemon, it will make for an easier process. We'll be able to easily create the base stats and the movepool, and it won't be too much of a hassle to create the art. Additionally we'd be able to make a UU/NU pokemon, such as Chatot, Farfetch'd or Dunsparce, more usable. On the other hand, creating a new pokemon would make it easier to mold. It would also provide much more creativity in terms of actual design. We could come up with a new pokemon based on stuff like goats, knights and hydras (HYDRAS!). Honestly, I'd have to go with create a new pokemon, as I love having the freedom of creativity. Though if we did go the evolution route, I would suggest Farfetch'd, Chatot, Stantler, and Banette.
EDIT: Just did a preliminary count of votes (ONLY THE BOLD VOTES, THOUGH). How long is this going to be open, exactly? Anyways, here's the results so far:
New Pokemon - 17
Evolved Pokemon - 20
):
Oh well, if we do go the evo route, I once again suggest Farfetch'd, Chatot, Stantler and Banette. I'd also like to toss in Sableye, Mawile and Volbeat/Illumise. Luvdisc deserves to rot in the depths of NU, though.