I'd like to see 2 more Sawk/Throh related Pokémon. I've designed my own for my hack (Pre-evo: Slahp) (Alt. Evo: Energee) ; but, it'd be nice to see official ones.
Scrafty would be another interesting choice for future evolution, as with Cofagrigus, Emolga could as well. I'd like to see a Galvantula evolution too.
Also an alternative evolution to Elgyem, I like Beheeyem; but, with the alien concept, there's so much you could do with that.
Bouffalant, I'd like to see with a pre-evo. It's basically too similar to Tauros right now. Basically, it's Black Tauros.