This meta will be an allowed list meta, but with a rather long list of Pokémon being approved. Below is a search string for the meta, followed by the infographic that explains what the search string will pull up that isn’t allowed. Some Pokémon only have one regional form approved, and a few are allowed as shadows only. Below the infographic will be a text list of the allowed Pokémon if you prefer to browse it that way.
cp-1500&2-3,5-6,8-9,18,24,26,36,38,40,42,45,47,49,51,53,55,59,62,65,67-68,70-71,75-76,79-80,82-83,88-89,93-95,101,103,105-107,110,113-114,122-123,125-127,130-131,134-137,142-146,148-151,157,164,168-169,181-182,185-186,196-200,203,208,212,214,233,237,242-245,248-250,256-257,272,279,282,297,303,311-314,317,324,330,332,356,359,375-376,382,394,402,409,416,423,425-426,429-430,438,441,446,448,462,465-467,470-471,474-475,477,479,497,530-531,534,569,571,573,609,611-612,658,696-697,699-700,702,706,715,721,723-724,737-738,815,820,838-839,849,887,908,923,927,936-937,941,958-959,978
Absol
Aerodactyl
Alakazam
Ampharos
Arbok
Arcanine
Arcanine (Hisuian)
Ariados
Armarouge
Articuno
Articuno (Galarian)
Audino
Aurorus
Bellossom
Blastoise
Blaziken
Blissey
Bonsly
Cacturne
Carkol
Ceruledge
Chandelure
Chansey
Charizard
Charjabug
Charmeleon
Chatot
Cinccino
Cinderace
Clefable
Coalossal
Combusken
Conkeldurr
Crobat
Dachsbun
Dartrix
Decidueye
Dedenne
Dragapult
Dragonair
Dragonite
Drifblim
Drifloon
Dugtrio
Dugtrio (Alolan)
Dusclops
Dusknoir
Electabuzz
Electivire
Electrode
Electrode (Hisuian)
Entei
Espeon
Excadrill
Exeggutor
Exeggutor (Alolan)
Farfetch’d
Farfetch’d (Galarian)
Flareon
Flygon
Fraxure
Gallade
Garbodor
Gardevoir
Gastrodon
Gengar
Girafarig
Glaceon
Golbat
Golduck
Golem
Golem (Alolan)
Goodra
Graveler
Graveler (Alolan)
Greedent
Greninja
Grimer
Grimer (Alolan)
Gyarados
Hariyama
Haunter
Haxorus
Heracross
Hitmonchan
Hitmonlee
Hitmontop
Ho-Oh (shadow only)
Honchkrow
Illumise
Ivysaur
Jolteon
Kilowattrel
Kricketune
Kyogre (shadow only)
Lapras
Leafeon
Lucario
Ludicolo
Lugia (shadow only)
Machamp
Machoke
Magmar
Magmortar
Magneton
Magnezone
Marowak (Alolan)
Mawile
Meowscarada
Metagross
Metang
Mew
Mewtwo (shadow only)
Minun
Misdreavus
Mismagius
Moltres
Moltres (Galarian)
Mr. Mime
Muk
Muk (Alolan)
Munchlax
Murkrow
Ninetales
Ninetales (Alolan)
Noctowl
Noivern
Onix
Parasect
Pawmot
Pelipper
Persian
Pidgeot
Pinsir
Plusle
Politoed
Poliwrath
Porygon
Porygon-Z
Porygon2
Prinplup
Raichu
Raichu (Alolan)
Raikou
Rampardos
Rotom
Scizor
Scyther
Serperior
Slowbro
Slowbro (Galarian)
Slowking
Slowking (Galarian)
Slowpoke
Snorlax
Steelix
Sudowoodo
Suicune
Swalot
Sylveon
Tangela
Tangrowth
Tatsugiri (Curly)
Tatsugiri (Droopy)
Tatsugiri (Stretchy)
Tinkaton
Tinkatuff
Torkoal
Toxtricity
Typhlosion
Typhlosion (Hisuian)
Tyranitar
Tyrantrum
Tyrunt
Umbreon
Vaporeon
Venomoth
Venusaur
Vespiquen
Victreebel
Vikavolt
Vileplume
Volbeat
Volcanion
Wartortle
Weepinbell
Weezing
Weezing (Galarian)
Wigglytuff
Zapdos
Zapdos (Galarian)
Zoroark
Zoroark (Hisuian)