C+--> A
I don't know how this thing ended up in C+ ranking but I think it gotta be the wrongest placement I have ever seen (sorry for the invented english but there are no existing words that are able to describe this case).
reasoning:
-Great defensive cores: Clodsire is without a doubt one of the best special walls in gen 9. 130 HP and 100 Spdef is insanely bulky and pairing that with ground/poison with immunity to water is just great. Together with dondozo/corviknight it can create seriously amazing defensive cores that almost feel unbreakable.
-learns all hazars: this is actually great thing for clod spammability. The fact it can learn stealth rock, spikes and toxic spikes make it incredibly easy to fit in any team depending on the needs. This is ofter overlooked but I belive no pokémon has this kind of versatility in the hazards department. I am currently using a team with toxic spikes clod and I am finding alot of success (about top 100 ladder placement) and usually i'm a trash player.
-Benefits from recent meta change: there is a notable change that, in my opinion, make clodsire even better in the current meta. First of all Hisuain samurot is everywhere, meaning that hatreene usage is much, much lower than before since its main role is to block hazards. Hatreene was obviously a problem for clod that could just throw in an eq that was immediately recovered with lefties + draining kiss. Now this counter usage is lower, making clod much better and free to set up hazards or click toxic.
before I see this argument:
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I think that the introduction of G king is not at all a problem for clod. Those two mons for sure share things in common that are relevant: both poison types that are specially defensive. With that being said their typing is still very different. Clod is immune to water, electric and neutral to dark. Those differences are huge. G king is mainly used for pivotting while clod for pure walling and setting hazards. I still think G king all things considered is better than clod (thus in A+ while clod in A imo) but it is no way a subsitute of clod. I don't think that there is a strong substitue mechanic between the two since the roles are different.
-Clodsire does well against the strongest newly introduced mons: last but not least I think that clod actually deals well with alot of the strongest new mons introduced:
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beware, i'm not saying that clod necessarily wins the 1v1 against all the above mentioned mons regardless of the sets, for sure it annoys all of them pretty well. Sub calm mind enam destroys clod but clod for sure annoys the soul out of the specs enam set. Some are just walled and lose the 1v1 to clod such as Zap, Volcanion and G king.
these are just the new mons, clod still steals gholdengo's gold and makes walking wake walk away to UU. What I am trying to say is that closire has alot of good/great matchups in the meta against the most relevant mons.
In short Clod is simply an amazing mons that I belive fits very well in the meta. My empirical evidence is that I've reached 1900 rating with clod and generally I am a terrible player. I know this is not statistically relevant but if clod, supposedly a C+ rank mon, takes a player like me to top 100 ladder there is something wrong for real.
Jokes aside I think to have acquired enoguh experience to say that clod does pretty well in this meta and C+ is just too low of a ranking. It does much better than mons in the same ranking and also the ones above. I mean seriously clodsire is worse than Tornadus therian, greninja, enam therian??? I think it is much, much better than those. and again this mon is not only generally strong but also super spammable as it is essentially a glue that can create good defensive cores with alot of partner mons.