I probably should have mentioned this before but forgot, the Pokedex 3D was removed from the 3DS eShop today, it will be replaced by the Dream Radar and Pokedex 3D Pro apps this Sunday for NA on launch day
Unfortunately these aren't free like the original 'Dex was and cost $2.99 & $14.99 respectively
The Dream Radar
An AR game using the 3DS' camera, the player shoots clouds to obtain orbs and progress through levels, obtaining Pokemon and items to be transferred to B2/W2 along the way much like the Dream World from the original Black & White
Completing the game unlocks the alternate forms of the Kami Trio (Thundurus, Tornadus, Landorus) and having Gen IV games in the game slot allows you to catch legendary Pokemon from that game and transfer them to B2/W2
Pokédex 3D Pro
Essentially an upgraded version of the Pokedex 3D, however this time you get every single Pokedex entry right off the bat
It also has a "Challenge Mode" to test your knowledge of Pokemon silhouettes, cries, moves, and stats
this is not going to go over well
not well at all