Well, the first Pokémon game coming for the 3DS (excluding the Dex) may not be what you were waiting for. This screenshot was posted on the Japanese partner ShellSpider and is of a game reservation info list from Lawson (a Japanese convenience store).
Obviously this is NOT rock hard information as the game has yet to be even announced by Nintendo, but often retailers get information much earlier than the announcements are put out
From what the rumor claimed, it’s going to be in CoroCoro this month and will be released in October. It is a spiritual sequel to Pokemon Rumble for the WiiWare (which was called Pokemon Scramble in Japan), except it’s a lot more expansive and is a four player (local and WiFi) Gauntlet-style game.
There are only 5th Gen Pokemon included except for Pikachu, at least judging by the preview in CoroCoro, and the initial playable character are Pikachu, Snivy, Tepig, and Oshawott. You basically run around hack-and-slashing your way through other Pokemon, and each Pokemon can level up and learn new attacks. It utilizes the models from the recent 3D Pokedex, apparently. Kind of a non-turn based Mysterious Dungeon, you could say. – Kenhorou[/p]
Great! At least some details on the Pokémon 3DS game! Althought I'd have liked something along the lines of a Pokémon Stadium 3D or Pokémon Colosseum/XD 3, I really enjoyed the Pokémon Scramble. It was a nice hack'n'slash WiiWare, and now with the cool 3D models, it would also explain why only the new Pokémon were on the 3D Pokédex app. I'm looking forward to it.