Tropius deserves this the most imo. I can't really see it evolving any further, while the others listed here are quite viable on their own or can be improved if GF decides to give them a key move or ability like what they did with Scizor. Carnivine and Maractus seem open for a regular evolution, so Tropius here needs it most. It's a nice concept, but it's stats are what's hindering it, being lacklustre in almost all aspects.
Pokemon Black Version FC: 1506 5124 1112 Pokemon Black Version 2 FC: 1636 2111 7801