Ok, to dispel a myth. Tinkaton do not hunt Corviknight. Their Scarlet dex Entry:
"This intelligent Pokémon has a very daring disposition. It knocks rocks into the sky with its hammer, aiming for flying Corviknight."
Admittedly they probably wouldn't mind scavenging a Corviknight's corpse/shed feathers, but in actuality, they just throw giant boulders at Corviknight because they are demented Gremlins (apt considering Gremlins first showed up in folklore to explain malfunctions in aircraft). The Corviknight themselves are fine, anyone the Corviknight was carrying, less so.
Their line explicitly hunts Pawniard and Pisharp, whose sub Dark typing and much lower defenses make it a much more even fight.
Demented Gremlin
Tinkaton
-Stealth Rock
-Thunder Wave
-Gigaton Hammer
-Knock Off
Ability: Mold Breaker
Item: Leftovers
EVs and Nature:
252 HP / 252 DEF / 4 SDEF
Calm Nature (+SDEF, -ATK)
Tinkaton has a lot going for it as a disruptive Pokémon. Steel Fairy is fantastic defensively, Mold Breaker is an Arceus-send against Gholdengo's Good as Gold who normally stops such shenanigans. Excellent Speed for what is a normally a defensive Pokémon is crucial in getting disruption off, giving Tinkaton more favorable matchups. Gigaton Hammer ensures Tinkaton is entirely passive. Knock Off is another great boon, especially given its current limited distribution, as item disruption is at a premium currently.
However, Tinkaton's current environment is very much hostile to it. Offensive teams have rarely been stronger, giving Tinkaton few opportunities to perform its duties. Additionally, several of the strongest/most popular Pokémon in the format (Great Tusk, Chi-Yu, Ting-Lu, Skeledirge, Garchomp, Dondozo, Iron Treads, etc.) All have relatively favorable matchups against Tinkaton (yes most of them hate Play Rough, but are often faster or have the Bulk to tank one).
Lackluster offense nearly makes Attacking sets less than optimal while support sets have extremely stiff Competition with Grimmsnarl whose Prankster offers more utility against anything not named Gholdengo and item disruption is often better handled by Meowscara, who has STAB on Knock Off and access to U-Turn for a hit an run style that better suits Knock Off. Lack of reliable recovery offsets Tinkaton's good defenses and typing.
Other Options
Screens -Reflect and Light Screen are fantastic options for any supporter, but again, stiff competition with Grimmsnarl.
Edit: Also how are Tinkaton the reason Corviknight can't be used as Taxis when there are literally no wild Tinkaton?!