Impressive argument but i still cant agree with it staying C-. Is it utter garbage? No but its not at all good, decent or even reliable on a team. Being weak to Steel/Poison is better then Rock/Grounds many weakness but those rock or ground types have something to pull through. From Solrocks Burns+Recovery, Probos pivot or even Armaldos Rapid Spin/Knock Off. Other rock setters are able to do what it does but better. In the same way? No these mons dont have competitive but stilWhile not great, wiggly is cool because it can take like one hit from practically anything outside of like stout and either get a kill or set up rocks (which it can also do on a lot of the weaker stuff in the tier). it has nice bulk, good coverage and a cool ability, and legitimately threatens every defogger in the tier. Not sharing a rock or ground typing with most rockers outside of monferno and metang is also somewhat underrated imo. It hasn't really gotten any worse as its let down by weakness to physical wall breakers but otherwise has good bulk and cool coverage and I don't think it needs to drop.
As for Competitive that can be a two-way street. Yes its good but it relies on defog which people play around on and expect from mons such as Pawniards defiant. It is very predictable and while wiggly being uncommon makes people not aware of competitive that doesnt exactly warrent it being C- due to its own low usage.