I would like to see new evo's and preevos for the pokemon that dont have an evo form. For example: Pinsir, Heracross, Skarmory, Spinda, Aerodactyl, Tropius, Zangoose, Seviper, Pachirisu, etc. I think that it is kind of sad to train these pokemon and not see them evolve/ change in their whole life. They have a right to evolve too! But that is just me being obssesed with evolution.
Also, some of these single phased pokemon have very low stats if not trained properly and can be easily beaten by other stronger pokemon. For instance, take Sableye. Such a good pokemon (which I like) deserves better stats and an preevo/evo. But again, that is just me being obssesed with evolutions!!!!!.