Pikachu needs a new alternate evolution or Form Change to reinvigorate the line. I think the same is true of Meowth - at least he should get a Baby.
And Kangaskhan needs a baby evolution so that we no longer have pregnant mothers hatches from eggs.
Psyduck, for all it's popularity, could also be cooler with a baby form or an alternate evolution into something that still keeps it's appearance. Like some sort of Psychic Platypus.
I would not object to Baby evolutions for Tauros/Miltank and Volbeat/Illumise that evolve based on gender, as so many have proposed.
Also, I really want Unown to do SOMETHING other than sitting around in alphabetical order. I really like what the TCG did and I think it should be applied in the games: Have 17 new Forms for Unown that are created by taking several Unown, arranging them in your party to form a word, and using an item to permanently fuse them together. For instance, spelling out F I R E with the Unown would get you a Psychic/Fire-type Unown that could actually LEARN ATTACKS and DO SOMETHING.
Pokemon that need an evolution to actually make them viable "IE - Give these Pokemon evolutions so they'll be someone out there using them" category:
Farfetch'd, Girafarig, Qwilfish, Magcargo (way too weak to Water and Ground to ever be used majorly), Stantler, Smeargle, Delibird, Sableye, Mawile, Spinda, Kecleon, Chimecho, Luvdisc, Pachirisu, Plusle and Minun, and Chatot are in desperate need of being brought up to speed via evolutions. The list I had used to be longer, but they patched a lot of the totally useless Pokemon in Generation IV. Most of which were non-evolvers with awful stats from Johto.
In the "it would be nice but not entirely necessary category":
Absol, Sunflora, Cherrim, Corsola, Delcatty, Dunsparce, Electrode (can we turn it into something that doesn't look like a ball with a face?!), Kricektune, Torkoal.
In the "never-happen category but would make up for years of crappiness" category:
A useful third-tier evolution for all of the Vendor Trash Pokemon via item. Namely, Raticate, Bibarel, Furret, Mightyena, and Linoone.
