Keep in mind, I searches through the entire pokedex and handpicked each pokemon from Kanto to Galar. Also, if a gym leader happens to own a pokemon I didn't mention, even though I didn't mention it, it's still in the game. Also, if you see a (f) or (b) next to a pokemons name, that means it's exclusive to either pokemon blessed or fallen. Anywho, let's get started!

Weedle
Kakuna
Beedrill
Spearow
Fearow
Ekans
Arbok
Pichu
Pikachu
Raichu
Sandshrew
Sandslash
Cleffa
Clefairy
Clefable
Vulpix (b)
Ninetails (b)
Growlithe (f)
Arcanine (f)
Oddish
Gloom
Vileplume
Bellosom
Igglybuff
Jigglypuff
Wigglytuff
Zubat
Golbat
Crobat
Diglett
Dugtrio
Meowth
Persian
Pysduck
Golduck
Tentacool (f)
Tentacruel (f)
Ponyta
Rapidash
Magnemite
Magneton
Magnezone
Seel (b)
Dewgong (b)
Grimer
Muk
Ghastly
Haunter
Gengar
Onix
Steelix
Krabby
Kingler
Cubone
Marowak
Tyrouge
Hitmonlee
Hitmonchan
Hitmontop
Lickitung
Lickilicky
Happiny
Chansey
Blissey
Horsea (b)
Seadra (b)
Kingdra (b)
Staryu (f)
Starmie (f)
Mime Jr.
Mr. Mime
Magikarp
Gyrados
Lapras
Ditto
Eevee
Flareon
Vaporeon
Jolteon
Espeon
Umbreon
Leafeon
Glaceon
Sylveon
Aerodactyl
Snorlax
Dratini (b)
Dragonair (b)
Dragonite (b)
Sentret
Furret
Ledyba
Ledian
Chinchou
Lanturn
Togepi
Togetic
Togekiss
Mareep
Flaaffy
Ampharous
Hopip
Skiploom
Jumpluff
Sunkern
Sunflora
Wooper
Quagsire
Murkrow
Honchcrow
Girafarig
Gligar
Gliscor
Shuckle
Sneasel
Weavile
Teddiursa
Ursaring
Mantyke (b)
Mantine (b)
Remoraid (f)
Octilary (f)
Skarmory
Phanpy
Donphan
Milktank
Larvitar (f)
Pupitar (f)
Tyranitar (f)
Tailow
Swellow
Ralts
Kirlia
Gardevoir
Gallade
Shroomish
Breloom
Skitty
Delcatty
Sableye (f)
Mawile (b)
Plusle (b)
Minun (f)
Budew
Rosealia
Roserade
Wailmer
Wailord
Swablu
Altaria
Feebas
Milotic
Castform
Shuppet
Banette
Tropius
Spheal
Sealeo
Walrein
Luvdisc
Trapinch (b)
Vibrava (b)
Flygon (b)
Bagon (f)
Shelgon (f)
Salamence (f)
Starly
Starvia
Staraptor
Bidoof
Bibareal
Kriketot
Kricketune
Shinx
Luxio
Luxray
Pachirusa
Cherrubi
Cherrim
Shellos
Gastrodon
Chingling (b)
Chimecho (b)
Stunky (f)
Skuntank (f)
Chatot
Gible (f)
Gabite (f)
Garchomp (f)
Hippoptas
Hippodown
Carnivine
Fineon
Lumineon
Munna
Musharna
Blitzle
Zebstrika
Woobat
Swoobat
Drillbur
Excadrill
Audino
Sewaddle (b)
Swedloon (b)
Leavanny (b)
Venipede (f)
Whirlipede (f)
Scolipede (f)
Cottnee
Whimsicott
Darumake
Darmanitan
Mienfoo
Mienshao
Maractus
Dwebble
Crustle
Trubbish (f)
Garbodor (f)
Mincinno (b)
Cinncino (b)
Ducklett
Swanna
Vanillite
Vanilish
Vaniliuxe
Deerling
Sawsbuck
Emolga
Joltik
Galvantula
Klink
Klang
Klinklang
Tynamo
Elektrik
Elektross
Axew (b)
Fraxture (b)
Haxorous (b)
Cubchoo
Beartic
Druddigon
Rufflet
Braviary
Heatmor
Deino (f)
Zwellious (f)
Hydriegon (f)
Scatterbug
Spewpa
Vilvion
Flabebe
Floette
Florges
Skiddo
Gogoat
Furfrou
Swirlix
Slurpuff
Inkay
Malamar
Helioptile
Helioisk
Tyrunt
Tyrantrum
Amaura
Aurorus
Dedenne
Goomy (b)
Sligoo (b)
Goodra (b)
Kelfki
Noibat
Noivern
Cutiefly
Riombee
Rockruff
Lycanrock
Mareanie
Toxapex
Mudbray
Mudsdale
Fomantis
Lurantis
Salandit
Salazzle
Mimikyu
Drampa
Jangmo-o
Hakamo-o
Kommo-o
Blipbug
Dottler
Orbeetle
Chewtle
Drednaw
Rolycoly
Carkol
Coalossal
Applin
Flapple
Appltun
Clobbopus
Graploct
Falinks
Snom
Frosmoth
Cufant
Copperajah

Note that some pokemon listed might be presented as a Fulcrian form, or if a pokemon is unlisted.