I'm gonna start at the bottom of the tier with mons I don't feel are in the right place based on other mons in their rank and the ranks above them. Sorry for making such long posts I just enjoy writing and getting all of my thoughts and reasoning out before people criticize. I'm going to try putting some baseline mons that represent each different viability category to kind of put my suggestions in perspective.
D- Viability Changes
When I looked at D- there were two mons that I felt did not fit in with things like Jumpluff, Hypno, and Noctowl. I understand these are shitmons but I don't think they are as shit as given credit for.
Armaldo
D- ---> C-
I know a lot of people are quick to dismiss armaldo as bad because it is pretty outclassed as a spinner D- ranking is way to harsh and really doesn't give credits to it's merits. Not only does this thing have access to rapid spin, but it also has access to decent bulk (75 - 100 - 80), a base
125 attack stat (same as sawk), decent dual stabs, swords dance, and a shitty but relevant nonstab priority in aqua jet. As I looked up the rankings I kind of thought it fit more it with mons like Arbok, Dusknoir, Ninjask, and Simisear who currently reside in C-.
Electrode
D- ---> D+
This has an extremely famous viable speed tier where it can out speed mostly anything without scarf. It is know to work pretty well on a few rain teams for setting rain, using taunt, and spamming thunder or voltswitch for momentum. It's obviously not the best but hey why can't it be considered alongside other things like lopunny, politoad, and rapidash? I think it would fit right in tbh.
Gigilith
D- ---> D
Yes this thing is CRAZY outclassed by so many things but damn is this thing good at doing it's job. I've just seen time and time again this thing pulls through switching in to take a physical hit, getting rocks up, and hitting one extremely powerful hit that is hard to switch into. I feel like as bad as it is, it is less dismiss-able then the other D- mons. D ranking contains mons like Duosion, Throw, dusclops, and Golduck.
D Viability Changes
Lapras
D ---> D+
I might be the only one but I have a shitton of trouble breaking this bulky mon without it hitting me with some pretty powerful stab waterfalls, freeze-drys, and ice shards. It has really good bulk and walls the most obscure things but just from experience I could see this thing rising a bit. Thoughts?
D+ Viability Changes
Lopunny
D+ ---> D
This is the first mon I feel really needs to move down. It has a few really interesting niches that it's not outclassed in by anything in the tier but at the same time those tend to be extremely easy to deal with if u have a well made team. I just don't feel like it keeps up with the other mons in D+ considering that those could actually work on a team ie avalugg, torkoal, or rapidash, while loupunny just ends up being a drag...
Shedinja
D+ ---> C
Yes this requires more support then about any mon in the game but I feel like viability wise it is pretty similar to ditto and carbink up in C viability. Although yes there are definetly countless ways to deal with it and it is pretty hard to manage, this thing has proven to be a threat in the right hands. It is a semi-decent wall considering it completely beats what can't hit it.
C- Viability Changes
Mantine
C- ---> C+
Sorry for bringing this up again but I feel like this has gotten a decent amount of support and frankly is more viable then things that are currently in C :/ It's really really good at what it does in absorbing hits, 100% countering a lot of common special attackers like typhlosion, gorebyss, and ludicolo. Yes it can be worn down with a lack of recovery or physical bulk but access to defog, haze, it's typing, and bulk allow it to be fairly decent to use in NU.
Stoutland
C- ---> C
I disagree with this thing being limited to the rank of hippopotus. Yes they are commonly used as a combo sand core that I have used myself, but this thing can destroy lives even after sand is long gone. This thing is a powerhouse wall-breaker that deserves a bit more...
Prinplup
C- ---> C+
I see this mon work over and over again... the only thing that is holding this back from being a top tier utility mon is it's lack of access to recovery. What really should be considered is it's bulk, access to reliable defog without being weak to rocks, and it's ability to set it's own rocks. It can be even more of a nuisance going for scald burns.
Mightyena
C- ---> D
Mightyena is one of those mons that is really only good on paper. People see it has stab sucker punch and moxie and imagine all the unbeatable power it has. In reality it has almost no power to go on before the boost and since it lacks pursuit it isn't ever guaranteed the moxie which almost everybody recognizes as this things main niche...
C Viability Changes
Frogadier
C ---> C-
Quite honestly this things doesn't add too much to teams even with it's power from protean. Most of the time in NU it doesn't hit hard enough to get the job done, and is just under the speedcut needed to be considered really fast. (Base 97) Not that it is much worse I just feel it is more at home with things like Arbok and Heatmor.
Raichu
C ---> C+
I want to give a bit of hype to this mon considering it's base 110 speed, access to nasty plot and a solid movepool, and voltswitch momentum. I've seen these put in so serious work that isn't imitated much by the other fast voltswitch users in the tier.
Sawsbuck
C ---> C+
This mon is a threat with great dual stab, access to swords dance, decent speed, and an amazing ability in chlorophyll. I've seen this mon put in work and I would strongly recommend putting this up to C+
C+ Viability Changes
I do want to point out that in my eyes C+ seems to be where you start getting more consistant mons that but in huge amounts of work fairly consistently and rely less on very rare situations. These are mons that you can see working on teams.
Cradily
C+ ---> B-
As happy as I am with its current rank I still want to put out the argument that it has a place in B- with things as inconsistent as linoone, kadabra, and rotom-frost. Honestly a lot of things that were notably better then cradily such as steelix, leafeon, and bouffalant have moved up and I feel like it would fit in fine.
Lampent
C+ ---> C-
I've rarely seen this thing and the times that I have it hasn't been hard for my teams to deal with. It might have nice offensive typing but... idk if it deserves to be where it is.
Zweilous
C+ ---> B-
At first I was pretty skeptical about this mon but after seeing it a few times it's typing is really hard to deal with and it can also pack a punch with the banded hustle set.
Viability Changes B-
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krickotune | Leavanny
B- ---> C
The web setters really don't play that big or a role in this tier. They almost never do anything else and tend to be pretty ez to deal with.
Drifblim
B- ---> C+
Yeah this thing is interesting with unburden, multiple ways to set up and baton pass some stats over, but I feel like it is sitting around mons that are far more useful then it is...
Sandslash
B- ---> B
Whenever u think of what the most reliable spinner in the tier is, you think cryo, kabutops, and sandslash. Kabutops often has better things to do then spin and cryo is weak to rocks so I feel like this can safely hold the title as best spinner in the tier and it also has that access to Stealth Rock.
Scyther
B- ---> B
Well as much support as this needs from preventing rocks from going up this has a great troll tier speed, access to swords dance, uturn and roost or whatever u want to do with it. I feel like it is either very good for B- or pretty bad for B.
Viability Changes B
Simipour
B ---> C+
I honestly feel like this doesn't break 2 much that other waters don't and is pretty outclassed by sweeper gorebyss who also has the ability to pass it's stats.
Torterra
B ---> C
All in all this mon seems to lack the ability to do as much as other mons it is surrounded by and it is crippled heavily by so much...