Two updates from Serebii; one for a promotion where you can get a free download of Pokemon X or Y in the US in March, and another noting the conclusion of online services for Pokemon DS and Wii games in May.
Pokémon X & Y - Free Distribution
Following a rumour last week, it has been confirmed by Nintendo of America that, for people who live in the United States of America, if you purchase a Nintendo 3DS, 3DS XL or Nintendo 2DS as well as one game of the following: Yoshi's New Island, Animal Crossing New Leaf, Lego City Undercover: The Chase Begins, Super Mario 3D Land, Donkey Kong Country Returns 3D or Mario Kart 7, and register them on the Club Nintendo website, you will receive a free download copy of Pokémon X or Pokémon Y. This promotion only runs in March 2014 so be sure to get it while you can
(actually if you haven't registered your 3DS/2DS already, you probably wouldn't need to buy a new one, just get one of the games and register)
Pokémon - Online Services
Nintendo has announced that, as of May 20th 2014, all online services across the DS and Wii games will terminate. This means that you will not be able to go online with any of the following Pokémon games: Pokémon Diamond, Pokémon Pearl, Pokémon Platinum, Pokémon HeartGold, Pokémon SoulSilver, Pokémon Battle Revolution, Pokémon Black, Pokémon White, Pokémon Black 2, Pokémon White 2, My Pokémon Ranch, Pokemon Mystery Dungeon: Explorers of Time, Pokemon Mystery Dungeon: Explorers of Darkness, Pokemon Mystery Dungeon: Explorers of Sky, Pokemon Ranger: Guardian Signs, Pokemon Ranger: Shadows of Almia & Pokémon Conquest. All online features of these games will be inaccessible, regardless of the console you play them on. All 3DS and Wii U games will continue to be playable online.