Stuff that's in the NU Tier should have some evolutions, provided they are unique. Jynx is one of them, she can evolve into a killer Ice/Psychic.
Unique means that they're not a water type with lame stats and has the name of Luvdisc...unless it requires me to use it as an evolution, or doubles the happiness while I walk like Soothe bell, it's staying firmly in my PC.
Others to consider:
Corsola
Kricketune
Mawile
Parasect (Give it a type combo that doesn't make it super weak to Aerial Ace and Flamethrower....)
Sunflora - first Grass/Fire...it can happen
Torkoal
Tropius
Some underused:
Banette
Electrode (Electric/Fire)
Girafarig
Mr. Mime
Primeape maybe?
Qwilfish
Sableye
Sandslash
And for my own personal hope, Houndoom