Metal Overlord
Smash Hero
I would think that both would have good chances, but I agree, not as big as Victini's and Zoroark's chances, with them both being poster boys for the 5th gen, at arguably the most crucial time pertaining to Smash (when Sora and company start deciding the roster).Let's say that Genesect/Meloetta was revealed early-mid next year and the game released late 2014 or latter. The one revealed first becomes a popular choice, being around Vicitini's and Zoroark's level for requests if not slightly more. It also get a movie in the summer of 2012.
How will you feel about its chances?
I think they would have a reasonable shot, although not as big as Zoroark or Victini.