Raticate
Leave Raticate alone! LEAVE HIM ALONE!! You don't know what he's been through!
.....
Right...
Anyways, Raticate doesn't seem to need an evolution. Ever since it's introduction in Gen 1, it's been one of the more versital pokemon in the game, and can learn multiple elemental moves to surprise opponents...so does he even warrent it?
I'm personally for leaving most of them as they are, especially Farfetch'd and Tauros. They're perfect as it is, no need to tamper with them. However, I would like to see Ledian get an evolution, it's pitiful as it is. Maybe into a HUMONGOUS ladybug or something.
I don't want any new evolutions of old pokemon, but I'm not against them if/when they show up.
Spinda could evolve into some kind of large panda and Luvdisc could evolve into I-don't-know-what. Those are two that could use a little more lovin' and new evolutions might do the trick.
I kind of want a Steelix evo for no reason. :P
Dragon Eevee and a Farfetch'd evo please!!
And my personal favourite candidate LANTURN!!
4th Gen: Gay