Here's all the pokemon in so far:
Caterpie-Metapod-Buttefree
Pichu-Pikachu-Raichu
Cleffa-Clefairy-Clefable
Vulpix-Ninetales
Diglett-Dugtrio
Growlithe-Arcanine
Machop-Machoke-Machamp
Gastly-Haunter-Gengar
Onix-Steelix
Rhyhorn-Rhydon-Rhyperior
Goldeen-Seaking
Magikarp-Gyarados
Eevee-Vaporeon/Jolteon/Flareon/Espeon/Umbreon/Leafeon/Glaceon/Slyveon
Munchlax-Snorlax
Hoothoot-Noctowl
Chinchou-Lantern
Togepi-Togetic-Togekiss
Wynaut-Wobbuffet
Wooper-Quagsire
Mantyke-Mantine
Sneasel-Weavile
Larvitar-Pupitar-Tyranitar
Lotad-Lombre-Ludicolo
Wingull-Pelipper
Ralts-Kirlia-Gardevoir/Gallade
Electrike-Manectric
Wailmer-Wailord
Budew-Roselia-Roserade
Trapinch-Vibrava-Flygon
Feebas-Milotic
Duskull-Dusclops-Dusknoir
Snorunt-Glalie/Froslass
Combee-Vesiquen
Bronzor-Bronzong
Riolu-Lucario
Hippopotas-Hippowdon
Snover-Abomasnow
Roggenrola-Boldore-Gigalith
Tympole-Palpitoad-Sesimitoad
Sawk
Trubbuish-Garbodor
Minccino-Cinccino
Vanillite-Vanillish-Vanilluxe
Frillish-Jellicent
Axew-Fraxure-Haxorus
Golett-Golurk
Rufflet-Braivary
Deino-Zweilous-Hydreigon
Bunnelby-Diggersby
Pancham-Pangoro
Espurr-Meowstic
Swirlix-Slurpuff
Inkay-Malamar
Hawlucha
Goomy-Sliggoo-Goodra
Bergmite-Avalugg
Grubbin-Charjabug-Vikavolt
Wishiwashi
Mudbray-Mudsdale
Stufful-Bewear
Bounsweet-Steenee-Tsareena
Mimikyu

How's the regional dex so far?
Did i forget any?
What pokémon are you expecting?

And before you ask, no i'm counting the Charizard cause i always every previous starter and legendary are instantly absent, the only exception was X/Y (Kalos)

Its also worth noting that these are the available pokémon in VGC 2020