Black Glasses + tera dark Tera Dark should exclusively be is commonly used with Kowtow Cleave as these it propels Kingambit's offensive pressure;.
When "as" is used to mean "because", there should be a comma before it. Also, "should be exclusively used ..." is fine as-is. make sure not to change any content within analyses unless it interferes with the readability. you could also leave a comment for the writer with a suggestion.
Air Balloon allows Kingambit to setup on would be checks in Landorus-T and most Great Tusks, become a sturdy switch in switch-in to offense offensive threats like Kyurem, Roaring Moon, and Dragonite who rely on their Ground-type coverage to hit it Kingambit, and gain an immunity to Spikes that limits Kingambit's longevity before it gets going.
1: When we use "setup" as a verb, it should be "set up".
2: "would-be checks" needs a hyphen because it's a compound adjective (2 words to work as an adjective for a word) you can read more here
https://www.grammarly.com/blog/parts-of-speech/compound-adjectives/
3: The plural of a Pokemon is identical to the singular of that Pokemon. One Blissey, two Blissey. Never two Blisseys. You could do: "and most Great Tusk sets" for that 1st sentence
4: "who" is never used in analyses. replace with that / which as necessary -- "that" would be correct here. On the contrary, "Spikes that limit Kingambit's longevity" needs a "which" instead of "that"; also, "Spikes" and other pokemon terms (Leftovers) are singular, so you needed to keep it as "Spikes, which limits Kingambit's longevity"
5: you can see one list within another here. "offensive threats like Kyurem, Roaring Moon, and Dragonite"
To avoid confusion and improve readability when we have lists within lists, you can replace the commas in the original list with semicolons, like so:
Air Balloon allows Kingambit to set up on would-be checks in Landorus-T and most Great Tusk sets; become a sturdy switch-in to offense threats like Kyurem, Roaring Moon, and Dragonite that rely on their Ground-type coverage to hit it; and gain an immunity to Spikes, which limits Kingambit before it gets going.
Kingambit's late-game potential and defensive utility in the late game make it a nearly staple on offensive archetypes from Bulky to Hyper Offense bulky offense to hyper offense, while still fitting on Balance balance.
Removing "nearly" changed the meaning behind the sentence here. from almost always being a staple, to always being a staple. that counts as a qc change, so you could instead reword to "nearly make it"
If "while" means "whereas", then it needs a comma, but if it means "at the same time", no comma is needed.
Physically offensive teammates like Ogerpon-Wellspring Ogerpon-W, Zamazenta-H, and Swords Dance Iron Valiant can overwhelm shared checks like such as Zanazenta Zamazenta-H, Landorus-Therian Landorus-T, and Dondozo.
Physical teammates is fine
Zamazenta-H is the base forme so no need for -H. only add it if referring to the crowned forme (Zamazenta-C)
No need to swap like => such as here
Dark-type offensive threats in Darkrai, and Samurott-Hisui Samurott-H can form a Darkspam core with Kingambit to overwhelm Dark resists Dark-resistant Pokemon like Zamazenta-H and tera Tera Fairy users like Gholdemgo Gholdengo and Moltres together.
The correct way to refer to Hisui/Galar/Alolan mons is "Hisuian Samurott"
"Darkspam" core is not a coined term. You can edit it to "Dark-type spam core"
overall not bad at all! I think you could benefit a lot from having the
Spelling and Grammar standards open on the side or by taking a look it (re: forme names, Pokegrammar)
btw, AC means add comma, RC remove comma, AP period, ASC semicolon. it greatly helps with visibility for the writers