I will argue for Skiddo place in C-rank, mainly due to the fact that it can deal with Chou and is a very good lure for Flying-types, whom it can deal good damage to with Rock Slide. And access to two recovery options(Milk Drink and Horn Leech) means it can have longevity against teams to lack a Flying-type. Considering that Max Atk Fletch Acrobatics does not OHKO Skiddo after a Bulk Up is pretty impressive, and it can OHKO less bulky variants.
Some calcs:
-0 SpA Chinchou Ice Beam vs. 0 HP / 140 SpD Eviolite Skiddo: 10-12 (43.4 - 52.1%) -- 0.4% chance to 2HKO
-76+ Atk Skiddo Horn Leech vs. 76 HP / 212+ Def Eviolite Chinchou: 14-18 (56 - 72%) -- guaranteed 2HKO
(This is assuming Chou has Ice Beam, which many don't currently)
Of course Skiddo doesn't like Scald Burn, but that is the risk anything takes on switching into Chou.
-196+ Atk Fletchling Acrobatics (110 BP) vs. +1 0 HP / 52 Def Eviolite Skiddo: 14-18 (60.8 - 78.2%) -- guaranteed 2HKO
-+1 76+ Atk Skiddo Rock Slide vs. 0 HP / 92 Def Fletchling: 22-26 (104.7 - 123.8%) -- guaranteed OHKO
So if Fletchling switches in on Bulk Up, it ends up losing the fight and Skiddo may still have around 30% of his HP, which means he can take another hit from a Physical attacker and recovery with Horn Leech/Milk Drink.
76+ Atk Skiddo Rock Slide vs. 0 HP / 0 Def Murkrow: 18-22 (81.8 - 100%) -- guaranteed OHKO after Stealth Rock
Although this likely won't play out this way in an actual match(Skiddo likely won't be at 100%) this are pretty important since they mean Skiddo can KO a possible Check so easily after SR or some prior damage.
Like honestly, I'm not saying Skiddo is great, or even good, but it is pretty unique and has enough coverage to suit its needs. I believe these calcs are pretty relevant, since it allows it to fill a niche, which is why I think Skiddo belongs in C-Rank.(Of course you could argue that Fighting-types with Bulk Up can fill the same niche, however there is a reason most of them are A+ rank and they cannot deal with Chou as easily Skiddo, giving it a slight niche over them)
Some calcs:
-0 SpA Chinchou Ice Beam vs. 0 HP / 140 SpD Eviolite Skiddo: 10-12 (43.4 - 52.1%) -- 0.4% chance to 2HKO
-76+ Atk Skiddo Horn Leech vs. 76 HP / 212+ Def Eviolite Chinchou: 14-18 (56 - 72%) -- guaranteed 2HKO
(This is assuming Chou has Ice Beam, which many don't currently)
Of course Skiddo doesn't like Scald Burn, but that is the risk anything takes on switching into Chou.
-196+ Atk Fletchling Acrobatics (110 BP) vs. +1 0 HP / 52 Def Eviolite Skiddo: 14-18 (60.8 - 78.2%) -- guaranteed 2HKO
-+1 76+ Atk Skiddo Rock Slide vs. 0 HP / 92 Def Fletchling: 22-26 (104.7 - 123.8%) -- guaranteed OHKO
So if Fletchling switches in on Bulk Up, it ends up losing the fight and Skiddo may still have around 30% of his HP, which means he can take another hit from a Physical attacker and recovery with Horn Leech/Milk Drink.
76+ Atk Skiddo Rock Slide vs. 0 HP / 0 Def Murkrow: 18-22 (81.8 - 100%) -- guaranteed OHKO after Stealth Rock
Although this likely won't play out this way in an actual match(Skiddo likely won't be at 100%) this are pretty important since they mean Skiddo can KO a possible Check so easily after SR or some prior damage.
Like honestly, I'm not saying Skiddo is great, or even good, but it is pretty unique and has enough coverage to suit its needs. I believe these calcs are pretty relevant, since it allows it to fill a niche, which is why I think Skiddo belongs in C-Rank.(Of course you could argue that Fighting-types with Bulk Up can fill the same niche, however there is a reason most of them are A+ rank and they cannot deal with Chou as easily Skiddo, giving it a slight niche over them)