In addition to the launch of the Nintendo Shop on the 3DS this upcoming Monday (the sixth,) there will be a new Pokémon tool available to us: The Pokédex.
Working like an actual Pokédex, you must gather information on the Pocket Monsters to register them as seen, but this goes further. You must receive them via stickers (AR cards), spotpass, or from friends. This makes collecting Pokémon in this application substantially more difficult, as stickers only increase your spot pass possibilities.
Not only does it keep track of those you’ve seen, it represents them in 3D, displays all pertinent information, including moves it learns, it’s type efficiencies, stats, and more. Best of all, it’s completely free.