There are a few pokemon in the first 3 generations that I think should get a new evolution in Gen V.
Pinsir- One of the coolest bug pokemon in the games, and it doesn't have a baby poke or a second evolution.
Heracross-A fan favorite from the Johto region, definately needs an upgrade.
Qwilfish- A poison/water type fish with no evos to date.
Jynx- Along with Magmar and Electibuzz, Jynx got a baby pokemon in the second generation, but when the others got an evolution in the 4th Gen, Jynx did not.
Girafarig- I'm not sure why, but it seems like they could go further with this one.
Banette- One of the several from gen 3 that doesn't have an evolution. They could definately make this one have a cool evolution.
Torkoal- A popular choice for fire type trainers, needs an upgrade.
Spinda-This one looks like it should evolve, they could easily make an evo for it.
Luvdisc-Again, it just looks like it should evolve but doesn't.
Thats about all I can think of, feel free to drop suggestions!
Pinsir- One of the coolest bug pokemon in the games, and it doesn't have a baby poke or a second evolution.
Heracross-A fan favorite from the Johto region, definately needs an upgrade.
Qwilfish- A poison/water type fish with no evos to date.
Jynx- Along with Magmar and Electibuzz, Jynx got a baby pokemon in the second generation, but when the others got an evolution in the 4th Gen, Jynx did not.
Girafarig- I'm not sure why, but it seems like they could go further with this one.
Banette- One of the several from gen 3 that doesn't have an evolution. They could definately make this one have a cool evolution.
Torkoal- A popular choice for fire type trainers, needs an upgrade.
Spinda-This one looks like it should evolve, they could easily make an evo for it.
Luvdisc-Again, it just looks like it should evolve but doesn't.
Thats about all I can think of, feel free to drop suggestions!