What Pokemon can learn beat up?

Question

And which Pokemon is best suited with the move (which Pokemon should have the move?)

Answer 1

As of Pokémon Scarlet and Violet, these Pokémon can learn Beat Up,

/nds beat up, all (67 results)
Aipom, Ambipom, Annihilape, Arbok, Barbaracle, Binacle, Bisharp, Brambleghast, Bramblin, Charizard, Charmander, Charmeleon, Cottonee, Diglett, Diglett-Alola, Dragapult, Drakloak, Dugtrio, Dugtrio-Alola, Durant, Ekans, Falinks, Farigiraf, Fezandipiti, Girafarig, Houndoom, Houndour, Hydreigon, Kangaskhan, Kingambit, Krokorok, Krookodile, Mankey, Maushold, Mew, Mimikyu, Nickit, Nidoking, Nidoqueen, Nidoran-F, Nidoran-M, Nidorina, Nidorino, Nuzleaf, Pangoro, Passimian, Pawniard, Persian-Alola, Primeape, Salandit, Salazzle, Sandile, Scrafty, Scraggy, Seedot, Shiftry, Smeargle, Sneasel, Tandemaus, Thievul, Urshifu, Vanilluxe, Vespiquen, Weavile, Whimsicott, Wishiwashi, Zweilous

Though, Beat Up is far outclassed in terms of a Physical Dark type move by Knock Off, Sucker Punch, and formerly Pursuit. As far as I can recall, only Technician Ambipom used it in competitive singles in previous gens, though it prefers other moves in later games.

In doubles however, it's common for a Physical Attacker with Justified to be paired with a Special Attacker or Support Pokémon with Beat Up, such as Terrakion and Whimsicott.

Answer 2

These Pokemon can learn beat up:

Level up:
- Houndour, Houndoom
- Sneasal, Weavile

Breeding:
- Charmander, Charmeleon, Charizard
- Ekans, Arbok
- Nidoran♀, Nidorina, Nidqueen
- Nidoran♂, Nidorino, Nidoking
- Diglet, Dugtrio
- Mankey, Primeape
- Aimpom, Ambipom
- Girafarig
- Seedot, Nuzleaf, Shiftry
- Cottonee, Whimsicott
- Sandile, Krokorok, Krookodile

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I think that the most viable users of this attack would be Weavile, Krookodile, Shiftry and Ambipom.

The first 3 all get STAB and have a higher attack that special attack, and is more powerful than any other of their physical Dark type STABs when there are 6 Pokemon left.

The next option may sound a little strange, but Ambipom is actually a very viable user of Beat Up. It gets coverage on Ghost types, which is important as it will draw in many Ghost types due to its Technician STAB Fake Out, and can easily hit harder than Shadow Claw because of Technician.

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Source

Answer 3

By level up:
sneasel, houndor and houndoom.

By breeding:
charmander charmeleon charizard, ekans, arbok, nidoran, nidorina, nidoqueen, nidoran nidorino nidoking, diglet, dugtrio,mankey primeape, aipom girafaric, houndor houndoom, seedot, nuzleaf, shiftry, ambipom cottonee, whimsicott, sandile , krokorok, krookodile.