No they just get their regular movesets without any additional moves. So regular Ninetales and Bisharp can get all the newer generation moves, but Alolan Ninetales and Kingambit are stuck with their regular movepools.So from your examples, If I understand correctly, neither Ninetales-A nor Kingambit can get any legal moves in the meta and are forced to Struggle?
Here are some cool example sets I thought of for OMNT

Scizor @ Heavy-Duty Boots
Ability: Technician
Tera Type: [Fire Resistance]
EVs: 252 HP / 160 Def / 96 SpD
Impish Nature
- Salt Cure
- Shore Up
- Bullet Punch
- Mortal Spin
Scizor being Gen 2 gets access to moves from Gen 6-9. Salt Cure is great for fending off Steel and Water types, which normally resist Bullet Punch, as it puts them on a big timer. It is also great for this set as it gives Scizor a means to force Gholdengo out and allows it to Mortal Spin. You then have Shore Up or Strength Sap as options to recover HP, but Shore Up here is usually preferred.
The EVs here ensure Scizor can survive 2 Shadow Balls from Scarf Gholdengo.
This meta is also great because Scizor and many others lost options like Roost which they now get back a move that's similar.

Conkeldurr @ Life Orb
Ability: Sheer Force
Tera Type: Dark/Poison
EVs: 112 HP / 252 Atk / 20 SpD / 124 Spe or 132 HP / 252 Atk / 124 Spe
Adamant Nature
- Axe Kick
- Noxious Torque/Barb Barrage
- Wicked Torque
- Mach Punch/Mountain Gale
Conkeldurr is Gen 5 which means it only gets Gen 9 moves, but those moves are great for it because it now finally has access to better Sheer Force options. Just imagine trying to take on Sheer Force boosted Close Combat, Gunk Shot, and Wicked Blow, because you don't have to since Conkeldurr gets Axe Kick, 2 strong physical Poison moves, and Wicked Torque. You then can run Mountain Gale as an option that's way stronger than Ice Punch. Additionally you can run Mach Punch to get a jump on those faster Pokemon.
EV spread has 124 Speed to outspeed Clefable and 112 HP EVs if you decide to run Mach Punch so that Life Orb does less damage.

Alomomola @ Heavy-Duty Boots
Ability: Regenerator
Tera Type: Fairy
EVs: 4 HP / 252 Def / 252 SpD
Careful Nature
- Wish
- Burning Bulwark
- Chilly Reception
- Mortal Spin
Pretty much standard Alomomola set, but with new Gen 9 moves and hazard removal too. Burning Bulwark provides burns for physical Pokemon who otherwise are scared of hitting you. Chilly Reception is a good option if you're not running a specific Weather or if you're running an anti-weather option (Minus Speed and 0 IVs are an option too). You do this while passing wishes from Mola's massive HP stat too.

Pikachu @ Light Ball
Ability: Lightning Rod
Tera Type: Ice
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Nasty Plot
- Thunderclap
- Electro Drift
- Freeze-Dry/Frost Breath
Pikachu is fun because of Light Ball making it hit hard with little drawback. Here, Pikachu can use Priority to bypass its slow speed, better and strong Electric STAB, and actually does get some special Ice coverage (fun fact there hasn't been a special Ice move since Gen 6) in Freeze-Dry and Frost Breath. The former hitting Water/Ground types, and the latter being stronger and bypassing SpD boosts and screens.
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