Once Upon a Pokémon

Once Upon a Pokémon is an upcoming Japanese live-action/anime crossover short film produced by The Pokémon Company.

Plot
In Once Upon a Pokémon, an all-star ensemble of beloved characters from Pokémon assembles to take a group photo in honor of The Pokémon Company's 30th anniversary.

Humans

 * Ash Ketchum
 * Misty
 * Brock
 * Professor Oak
 * Delia Ketchum
 * Gary Oak
 * Officer Jenny
 * Nurse Joy
 * Jessie
 * James
 * Giovanni
 * The Cerulean Sisters
 * Sabrina
 * Erika
 * Suzie
 * Jeanette Fisher
 * Ritchie
 * Professor Ivy
 * Tracey Sketchit
 * Cissy
 * Casey
 * Wilhomena
 * Maizie
 * Bugsy
 * May
 * Max
 * Alanna
 * Princess Sara
 * Kelly
 * Dawn
 * Iris
 * Cilan
 * Bianca (Unova)
 * Georgia
 * Stephan
 * Serena
 * Bonnie
 * Clemont
 * Goh
 * Chloe
 * Liko
 * Roy

Pokémon

 * Bulbasaur
 * Ivysaur
 * Venusaur
 * Charmander
 * Charmeleon
 * Charizard
 * Squirtle
 * Wartortle
 * Blastoise
 * Caterpie
 * Metapod
 * Butterfree
 * Weedle
 * Kakuna
 * Pidgey
 * Pidgeotto
 * Pidgeot
 * Rattata
 * Raticate
 * Spearow
 * Fearow
 * Ekans
 * Arbok
 * Pikachu (Ash's)
 * Sparky (Ritchie's)
 * Raichu
 * Sandshrew
 * Sandslash
 * Nidoran
 * Nidorina
 * Nidoqueen
 * Nidoran
 * Nidorino
 * Nidoking
 * Clefairy
 * Clefable
 * Vulpix
 * Vulpix (Alolan Form) (Lillie's)
 * Ninetales
 * Jigglypuff
 * Wigglytuff
 * Zubat
 * Golbat
 * Oddish
 * Gloom
 * Vileplume
 * Paras
 * Parasect
 * Venonat
 * Venomoth
 * Diglett
 * Dugtrio
 * Meowth (Team Rocket's)
 * Persian (Giovanni's)
 * Psyduck (Misty's)
 * Golduck
 * Mankey
 * Primeape
 * Growlithe
 * Arcanine
 * Poliwag
 * Poliwhirl
 * Poliwrath
 * Abra
 * Kadabra
 * Alakazam
 * Machop
 * Machoke
 * Machamp
 * Bellsprout
 * Weepinbell
 * Victreebel
 * Geodude
 * Magnemite
 * Farfetch'd
 * Dodrio
 * Seel
 * Dewgong
 * Grimer
 * Muk
 * Gastly
 * Haunter
 * Gengar
 * Onix
 * Kingler
 * Lickitung
 * Weezing
 * Goldeen
 * Staryu
 * Starmie
 * Mr. Mime (Delia's)
 * Scyther
 * Electabuzz
 * Magmar
 * Pinsir
 * Tauros
 * Magikarp
 * Gyarados
 * Lapras
 * Ditto
 * Eevee
 * Vaporeon
 * Jolteon
 * Flareon
 * Omanyte
 * Omastar
 * Kabuto
 * Kabutops
 * Aerodactyl
 * Snorlax
 * Articuno
 * Zapdos
 * Moltress
 * Dratini
 * Dragonair
 * Dragonite
 * Chikorita
 * Bayleef
 * Cyndaquil
 * Totodile
 * Sentret
 * Furret
 * Hoothoot
 * Noctowl
 * Ledyba
 * Ledian
 * Spinarak
 * Ariados
 * Crobat
 * Chinchou
 * Lanturn
 * Pichu
 * Cleffa
 * Igglybuff
 * Togepi
 * Natu
 * Xatu
 * Mareep
 * Flaaffy
 * Ampharos
 * Bellossom
 * Marill
 * Azumarill
 * Sudowoodo
 * Politoed
 * Hoppip
 * Skiploom
 * Jumpluff
 * Aipom
 * Sunkerm
 * Sunflora
 * Yanma
 * Wooper
 * Quagsire
 * Espeon
 * Umbreon
 * Murkrow
 * Slowking
 * Misdreavus
 * Unown
 * Wobbuffet (Jessie's)
 * Girafarig
 * Pineco
 * Forretress
 * Dunsparace
 * Gligar
 * Steelix
 * Snubbull
 * Granbull
 * Qwilfish
 * Scizor
 * Shuckle
 * Heracross
 * Sneasel
 * Teddiursa
 * Ursaring
 * Slugma
 * Magcargo
 * Corsola
 * Remoraid
 * Octillery
 * Delibird
 * Mantine
 * Skarmory
 * Houndour
 * Houndoom
 * Kingdra
 * Phanpy
 * Donphan
 * Stantler
 * Smeargle
 * Tyrogue
 * Hitmontop
 * Smoochum
 * Elekid
 * Magby
 * Miltank
 * Blissey
 * Raikou
 * Entei
 * Suicune
 * Larvitar
 * Pupitar
 * Tyranitar
 * Lugia
 * Ho-Oh
 * Celebi
 * Treecko
 * Torchic
 * Blaziken
 * Mudkip
 * Marshtomp
 * Beautifly
 * Azurill
 * Skitty
 * Sableye
 * Plusle
 * Minum
 * Grumpig
 * Seviper
 * Lunatone
 * Solrock
 * Barboach
 * Whiscash
 * Corphish
 * Banette
 * Latias
 * Latios
 * Jirachi
 * Piplup (Dawn's)
 * Shinx
 * Luxio
 * Luxray
 * Buneary
 * Bonsly
 * Garchomp
 * Munchlax
 * Riolu
 * Lucario
 * Croagunk
 * Leafeon
 * Glaceon
 * Phione
 * Manaphy
 * Shaymin
 * Arceus
 * Victini
 * Snivy
 * Tepig
 * Pignite
 * Oshawott
 * Dewott
 * Patrat
 * Watchog
 * Lillipup
 * Herdier
 * Stoutland
 * Purrloin
 * Liepard
 * Pansage
 * Simisage
 * Pansear
 * Simisear
 * Panpour
 * Simipour
 * Pidove
 * Tranquill
 * Unfezant
 * Excadrill
 * Gurdurr
 * Throh
 * Sawk
 * Sewaddle
 * Leavanny
 * Venipede
 * Whimsicott
 * Krokorok
 * Krookodile
 * Scraggy
 * Minccino
 * Gothita
 * Emolga
 * Chespin
 * Fennekin
 * Braizen
 * Greninja
 * Bunnelby
 * Vivillon
 * Pancham
 * Spritzee
 * Clauncher
 * Sylveon
 * Hawlucha
 * Dedenne (Bonnie's)
 * Noibat
 * Noivern
 * Hoopa
 * Rowlet
 * Litten
 * Popplio
 * Brionne
 * Primarina
 * Rockruff
 * Lycanroc
 * Bewear
 * Togedemaru
 * Grookey
 * Scorbunny
 * Sobble
 * Corviknight
 * Yamper
 * Morpeko
 * Sprigatito
 * Fueoco
 * Quaxly

Music

 * Aim to Be a Pokémon Master

Trivia

 * TBA