Doraemon x Pokemon: Future Portal

Doraemon x Pokémon: Future Portal, also know in Japan as Doraemon x Pocket Monsters XY: Mirai Portal (ドラえもん x ポケットモンスターXY 未来ポータル) is a crossover television special set between the Doraemon and Pokémon universes. It is a co-production between Shgakukan-Shueisha Productions Co, Ltd. (who owns the rights to both the Pokémon and Doraemon franchises in Japan) and both series' respective production companies, Nintendo/The Pokémon Company, TV Tokyo, OLM, Inc., Fujiko Productions, Shin-Ei Animation, and TV Asahi.

Plot
Doraemon, Noby, and friends have been accidentally teleported - and end up trapped - in their favorite video game, Pokémon. They later encounter Ash Ketchum and friends who are battling with his archenemies, the Team Rocket, and must find a way to get them home.

From Doraemon:

 * Doraemon
 * Noby
 * Sue
 * Big G
 * Sneech
 * Dorami
 * Ace
 * Teacher
 * Tammy

From Pokémon:

 * Ash Ketchum
 * Pikachu
 * Misty
 * Brock
 * Professor Oak
 * Giovanni
 * Jessie
 * James
 * Meowth
 * Delia Ketchum
 * Nurse Joy
 * Officer Jenny
 * Mewtwo

Pokemon

 * Pikachu
 * Meowth
 * Alakazam
 * Venusaur
 * Electrode
 * Jigglypuff
 * Mewtwo
 * Hitmonlee
 * Grimer
 * Farfetch'd
 * Mankey
 * Venonat
 * Zubat
 * Hoothoot
 * Golduck
 * Arbok
 * Drowzee
 * Clefable
 * Pinsir
 * Wartortle
 * Machoke
 * Poliwrath
 * Magnemite
 * Voltorb
 * Butterfree
 * Zapdos
 * Pidgeot
 * Golbat
 * Geodude
 * Koffing
 * Goldeen
 * Horsea
 * Vaporeon
 * Psyduck