Doraemon x Pokemon: Future Portal

Doraemon x Pokémon: Future Portal, also know in Japan as Doraemon x Pocket Monsters: Mirai Portal (ドラえもんXポケットモンスター未来ポータル) 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, Nobita, and friends have been accidentally teleported - and end up trapped - in their favorite video game, Pokémon. They later encounter Satoshi and friends who are battling with his archenemies, the Rocket Gang, and must find a way to get them home.

From Doraemon:

 * Wasabi Mizuta as Doraemon
 * Megumi Ohara as Nobita Nobi
 * Yumi Kakazu as Shizuka Minamoto
 * Subaru Kimura as Takeshi Goda
 * Tomokazu Seki as Suneo Honekawa
 * Chiaki as Dorami
 * Shihoko Hagino as Hidetoshi Dekisugi
 * Wataru Takagi as Teacher
 * Kotono Mitsuishi as Tamako Nobi

From Pokémon:

 * Rica Matsumoto as Satoshi
 * Ikue Otani as Pikachu
 * Mayumi Iizuka as Kasumi
 * Yuji Ueda as Takeshi
 * Unsho Ishizuka as Dr. Yukinari Okido
 * Kenta Miyake as Sakaki
 * Megumi Hayashibara as Musashi
 * Shinichiro Miki as Kojiro
 * Inuko Inuyama as Nyarth
 * Masami Toyoshima as Hanako
 * Chika Fujimura as Joy
 * Chika Takahashi as Junsar
 * Masachika Ichimura as Myuutsuu

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