these are a few i found:
- Pokemon Green - alternative to the Pokemon Blue we have in the U.S.
- Battle & Get! Pokémon Typing DS - only released in japan
- Pokémon Plus Nobunaga's Ambition - ds not been released but only avalible in japan so far
- Pokémon Battrio - arcade game in japan (again)
- Pokémate - mobile game for japan
- Pokémon Card GB2 - gameboy japan game
- Pokémon Mystery Dungeon: Keep Going! Blazing Adventure Squad, Let's Go! Stormy Adventure Squad, - - and Go For It! Light Adventure Squad - a wii version of pokemon mystery dungeon for japan
there the only games i can find that havent been released in the u.s
there all from japan
there are also games that havent been released in europe mainly the japanese ones but some such as
Pokémon Trading Card Game-the origanal gameboy game only for north america japan and the african asia regeion - there are about 18 more that havent been released in europe and asia so consider yourself lucky
apparently mystery dungeon games and ranger games havent been released in europe (which is weird because im from england and have 2 of the ranger sereis and 3 of the mystery dungeon sereis -plus seen them sold in shops)
source wikipedia