edit: got it, never mind. Plushies are always first stage, even if you have evolved forms. I got confused since someone had a Togetic as their Alabamian.
edit2: Does Pikachu count as the "unevolved" form post Gen I? Pichu is technically the first form, although it's a baby Pokemon.
Yes, plushies must stay the first form of the line. So you see an Umbreon in the picture which means that Eevee is an option. Keep in mind, I just grabbed a picture to use for reference. I didn't take that picture recently or for this challenge, and I thought it'd be better to post that than just list everything.
It's cuter than a list.
Baby Pokemon do not have to be used, but only if they're in a line with three stages. So if your game has Pichu, you can use Pikachu instead. You could use Pichu if you really wanted, but I'll allow Pikachu. The same will apply for using Togetic instead of Togepi, but only in games that include Togekiss (gen IV and V in that case. Gen II and III players will have to stick with Togepi if they choose that.. Mantyke will have to stay Mantyke if that's chosen though, because it's only a two stage line. That make sense, everyone?
Also sorry I haven't updated the list. This is a really busy month for me, and I will get around to it in my free time before the really busy stuff happens!
And again...

Trainer Sydian
White 2


Neeko ♂ lv. 19 @ Everstone
Torrent | Adamant
[ Fury Cutter, Return, Water Gun, Razor Shell ]

Slick ♂ lv. 20
Drought | Timid
[ Flamethrower, Hypnosis, Energy Ball, Faint Attack ]
Immediately traded in Slick the Vulpix. My paw paw's nickname was Slick, so I thought it was appropriate for this Pokemon since I mainly chose it because I watched foxes with my paw paw. Caught him up pretty quickly, got them both to level 18, and went head first into Roxie's gym with no trouble! Now we have to go do Pokestar though. So this is gonna suck. :(