Nintendo has not announced any plans for Pokemon: Grey version or any special third version for Pokemon: Black and White versions.
EDIT: Pokémon Grey does not exist. You have, however, Pokémon Black 2 and White 2 which are direct sequels of the two former games and they are for the Nintendo DS, even though they can be played on a 3DS (without the 3D effect) since it's backwards compatible with DS games.
Pokémon X and Pokémon Y, which are the 6th Generation of the main-series and will be in fully 3D, will be released worldwide on October 12th, 2013 (excluding some countries).
It is exclusively for the Nintendo 3DS.
Pokemon X, Pokemon Y, and Pokemon Rumble Blast are some Pokemon games for the Nintendo 3DS.
No, Pokemon Black 2 and Pokemon White 2 will be available for both the Nintendo DS and Nintendo 3DS.
No, pokemon rumble blast is a game for the Nintendo 3DS
The Nintendo 3DS is backwards compatible with Nintendo DS titles, so all DS Pokemon games and subsequent 3DS Pokemon games will work on the 3DS.
Pokémon Grey does not exist. You have, however, Pokémon Black 2 and White 2 which are direct sequels of the two former games and they are for the Nintendo DS, even though they can be played on a 3DS (without the 3D effect) since it's backwards compatible.
Yes, Pokémon Omega Ruby and Pokémon Alpha Sapphire are 3DS games and therefore they're available to be played on any of the Nintendo 3DS or Nintendo 2DS systems that can play 3DS games and that includes Nintendo 3DS, Nintendo 3DS XL, Nintendo 2DS, the New Nintendo 3DS and the New Nintendo 3DS XL.
Pokémon Grey does not exist. You have, however, Pokémon Black 2 and White 2 which are direct sequels of the two former games and they are for the Nintendo DS, even though they can be played on a 3DS (without the 3D effect) since it's backwards compatible.
Pokemon Black and White will work on the 3DS like any other DS games and also supports the game's DSi-exclusive features. (This does, however, mean that region-locks apply when playing it on the 3DS)
actually nintendo has no plans for making a nintendo 3ds.
Yes you will be able to play Pokemon Black and White in the 3DS.
No, Pokemon Black and White, as well as Black 2 and White 2, are for the Nintendo DS. However, these games can still be played on the Nintendo 3DS familyNo, the games are exclusively for the DS. That's not to say the 3DS hasn't gotten a Pokemon game, though - X and Y were released for the 3DS last year.
Pokemon Dream Radar and 3D Pokedex are augmented reality games for the Nintendo 3DS.