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
 * 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
 * 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)
 * Raichu
 * Sandshrew
 * Sandslash
 * Nidoran
 * Nidorina
 * Nidoqueen
 * Nidoran
 * Nidorino
 * Nidoking
 * Clefairy
 * Clefable
 * Vulpix
 * Vulpix (Alolan Form)
 * Ninetales
 * Jigglypuff
 * Wigglytuff
 * Zubat
 * Golbat
 * Oddish
 * Gloom
 * Vileplume
 * Paras
 * Parasect
 * Venonat
 * Venomoth
 * Diglett
 * Dugtrio
 * Meowth (Team Rocket's)
 * Persian (Giovanni's)
 * Psyduck
 * 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
 * Scyther
 * Tauros
 * Magikarp
 * Gyarados
 * Lapras
 * Ditto
 * Eevee
 * Snorlax
 * Dragonite
 * Chikorita
 * Cyndaquil
 * Totodile
 * Sentret
 * Furret
 * Hoothoot
 * Noctowl
 * Ledyba
 * Ledian
 * Spinarak
 * Ariados
 * Crobat
 * Chinchou
 * Lanturn
 * Pichu
 * Cleffa
 * Igglybuff
 * Togepi
 * Xatu
 * Mareep
 * Flaaffy
 * Ampharos
 * 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
 * Bewear
 * Togedemaru
 * Grookey
 * Yamper
 * Sprigatito
 * Fueoco
 * Quaxly

Music

 * Casey's Victory Song
 * Aim to Be a Pokémon Master

Trivia

 * TBA