The list of Pokemon are ordered by the line's earliest appearance in the National Pokedex. All Pokemon accessible through either game's DLC is accounted for. Pokemon introduced prior to those added in Sword/Shield will be ignored, otherwise the vast majority of them would be present on this list.
Ekans and Arbok
Venonat and Venemoth
Mankey and Primeape
Bellsprout, Victreebel, and Weepinbell
Geodude, Graveler, and Golem (Kantonian and Alolan)
Doduo and Dodrio
Seel and Dewgong
Grimer and Muk (Kantonian and Alolan)
Drowzee and Hypno
Voltorb and Electrode
Chikorita, Bayleef, and Meganium
Cyndaquil, Quilava, and Typhlosion
Totodile, Croconaw, and Feraligatr
Sentret and Furret
Spinarak and Ariados
Mareep, Flaaffy, and Ampharos
Hoppip, Skiploom, and Jumpluff
Aipom and Ambipom
Sunkern and Sunflora
Yanma and Yanmega
Murkrow and Honchkrow
Misdreavus and Mismagius
Girafarig
Pineco and Forretress
Gligar and Gliscor
Snubbull and Granbull
Teddiursa and Ursaring
Slugma and Magcargo
Houndour and Houndoom
Phanpy and Donphan
Stantler
Smeargle
Poochyena and Mightyena
Surskit and Masquerain
Shroomish and Breloom
Slakoth, Vigoroth, and Slaking
Makuhita and Hariyama
Nosepass and Probopass
Meditite and Medicham
Plusle
Minun
Volbeat
Illumise
Gulpin and Swalot
Numel and Camerupt
Spoink and Grumpig
Cacnea and Cacturne
Zangoose
Seviper
Shuppet and Banette
Tropius
Chingling and Chimecho
Luvdisc
Deoxys
Turtwig, Grotle, and Torterra
Chimchar, Monferno, and Infernape
Piplup, Prinplup, and Empoleon
Starly, Staravia, and Staraptor
Bidoof and Bibarel
Kricketot and Kricketune
Cranidos and Rampardos
Shieldon and Bastiodon
Pachirisu
Buizel and Floatzel
Finneon and Lumineon
Phione
Manaphy
Darkrai
Shaymin
Arceus
Snivy, Servine, and Serperior
Tepig, Pignite, and Emboar
Oshawott, Dewott, and Samurott
Blitzle and Zebstrika
Sewaddle, Swadloon, and Leavanny
Ducklett and Swanna
Deerling and Sawsbuck
Alomoloma
Tynamo, Eelektrik, and Eelektross
Meloetta
Chespin, Quilladin, and Chesnaught
Fennekin, Braxien, and Delphox
Froakie, Frogadier, and Greninja
Scatterbug, Spewpa, and Vivillon
Litleo and Pyroar
Flabebe, Floette, and Florges
Skiddo and Gogoat
Hoopa
Pikipek, Trumbeak, and Toucannon
Yungoos and Gumshoos
Crabrawler and Crabominable
Oricorio
Minior
Komala
Bruxish
