Pinsir has the chance to be a second Heracross, if they give it a good enough evolution. It would also actually MAKE it a Fighting type, hopefully, which would be MAJOR bonus for it; seeing it has a lot of Fighting moves in its movepool. If the other bug-type of Generation I can have an evolution, (Scyther - Scizor) then surely Pinsir can have one.
Though it has a lot of evolutions, and I've said it a lot, already, I REALLY think a Normal-type Eeveelution should have been done when Eevee was brought into the game/show. you know; as a natural evolution of it, as opposed to all its "manipulated" evolutions. Not to mention, they'd be able to make GREAT use of Adaptability; one of Eevee's abilities.
Noctowl needs an evolution, I personally feel; a Flying/Psychic type to challenge Xatu. Proctowl! XD *was actually suggested to Wichu, back when I was on PokeComm for only a short while*
Wouldn't Ditto getting an evolution be the strangest of occurences...? o_o
I wonder what an evolution of Dunsparce would look like...
Qwilfish definitely needs to get an evolution...
Wonder what a branch-evolution of Shroomish would look like? I like Breloom and all, but I can't help but think about what Shroomish would look like as a normal plant, or something.
Not necessarily one I want, but Raichirisu is definitely going to make an appearance, in some future Generation. (evolution of Pachirisu)
That's about all I can think of, though.