Who do you choose? Obviously you can't choose to evolve Charizard/Mew/etc, but where it's applicable-who would you choose?
I would love to see a Heracross evolution. Even though it's already a force to be reckoned with, it'd still be interesting to see what GF comes up with in terms of design/strength.
I think Pinsir needs an evolution though. Never used one, and I'm not that big of a fan personally. But I've always felt bad Scyther looked way cooler and then got such an awesome evolution on top of that.
Bug/Steel or Bug/Dark Pinsir evolution would be cool.
(Trying to have a Pokemon discussion about the sixth gen that isn't about Fairies)
Audino, I want to have have an even more lucrative EXP giver in later areas. I also want to abuse it with Eviolite, Trick Room, and After You in this game's version of the Battle Tower. Cofagrigus would be even better for this but I don't want to get greedy.