Unique mons
I'm at level 33, my pokedex is at 223 caught, and these are the mons I still ever got ONE of:
Charizard
Golem
Muk
Lapras
Dragonair
Dragonite
Togetic
Espeon
Umbreon
Girafarig
Donphan
Blissey
(also Scizor and Politoed because of evo stones)
I was curious about which "unique" ones you guys have, as an interesting way to compare rares.
Answers
I found a single Piloswine....at about 11pm in a park around the corner.
I saw the silhouette on my ''sightings' and took off to the spawn point that has a history of rarer spawns and fortunatley I got the right spot.
It was not the ideal way to find it, late night in an unlit park, but I wasn't going to let it slip.
I consider it very lucky indeed to have seen and caught 1 of each. I thought they would be the holes in my dex.
Still need Ampharos, Tyranitar (have candies but waiting for a higher than 90%+IV one), Sneasel, Piloswine and Unown.
As you can see ice mon are a pain for me, it is crazy their spawn rate on my area, I have been playing every day since launch, just reached level 37, and only have around 40/50 ice mon in total... I am crossing my fingers for an ice event soon...
Don't have any regionals either a part from MrMime that is my exclusive.
Five of those are on my zero list, and my "Just One" list is quite a bit longer than yours. I'm level 33 also, and my pokedex is at 211 caught.
Singles:
Charizard, Venusaur, Blastoise, Sandslash, Nidoqueen, Nidoking, Ninetails, Primeape, Poliwrath, Machoke, Graveler, Golem, Magneton, Grimer, Cloyster, Gengar, Hypno, Electrode, Marowak, Rhydon, Chansey, Gyarados, Porygon, Omastar, Kabutops, Dragonair, Meganium, Feraligatr, Crobat, Pichu, Cleffa, Bellossom, Politoed, Wobbuffet, Girafarig, Forretress, Scizor, Sneasel, Magcargo, Piloswine, Kingdra, Hitmontop, and Smoochum.
Most of those 100-candy evolutions, I either could evolve more of them if I wanted (such as I have 207 Bulbasaur candy), or I could have evolved more if I hadn't decided to evolve a bunch of the mid-stage forms instead (such as 22 Nidorina).
And my Gen 1 Zero list:
Dugtrio, Machamp, Farfetch'd, Muk, Hitmonlee, Kangaskhan, #122, Jynx, Lapras, #144, #145, #146, Dragonite, #150, #151.
So I'm mostly down to the regionals and things that aren't in the game yet for things I've never gotten yet.
Gen 2 Zero list:
Typhlosion, 176, 180, 181, 192, 201, Granbull, 213, 214, 222, 225, Houndoom, Porygon2, 235, Miltank, Blissey, 243, 244, 245, 246, 247, Tyranitar, 249, 250, 251.
Houndour is very annoying in its uniqueness for me, I went to a supposed nest on the other side of the city and still got only one :( Other than that, I have a Chansey I don't care about, an Ampharos I don't have any candy for, a Muk I'll probably walk 'cos it's easier that all these 5km buddies, one Scizor with double steel moves who will have mates only if I get a spare Metal Coat, one Porygon2 and not so many candies for another, but a handful of annoying Up-Grades. Tangela with Infestation I don't care about, Hitmontop, Croconaw.
Caught 0 or 1 in dex apoart from regionals, 0 in gen 1, several in gen 2:
1: bayleef,
meganium,
croconaw,
bellosom,
politoed(no spare king's rock),
jumpluff,
sunflora,
umbreon,
unown (first day of our city tracker, 150-200m from my office),
steelix(no speare metal coat),
magcargo(from hatches only),
hitmontop,
pupitar,
tyranitar
0: feraligtr(not even sern in gym),
flaffy,
ampharos,
houndoom
ok mon i only have gotten one of:
hitmontop
blissey
politoed (this is by choice as I have no desire to re evolve as i have plenty of kings rocks in my items and more than enough candy to evolve)
espeon (also by choice as i keep chansey as my buddy to keep blissey powered up)
umbreon (same as above)
mon i have yet to get-
ampharos (getting closer)
unown
and the regionals i am unable to obtain
corsola
heracross
kanghatzkan
mr. mime
farfetched'