I assume you know of Pokémon Rumble Blast, which was released last year. Also, 3DS sales started off weak mainly because of the cost; the price cut of over 30% boosted sales considerably.
Technically speaking, Pokemon Black 2/White 2 will have 3DS exclusive stuff, namely the special forms of Tornadus/Thunderus/Landorus. But they will most likely not do a retail main game until Gen VI.
Whoa bro, better slow down bro, don't wanna be a bro, bro.