The Global Link has updated with an notice regarding the Pokémon Global Link. First, the Global Link will open up for a special X & Y version on October 12th 2013, after a 12 day long maintenance from the start of October. However, from January 14th 2014, various Pokémon Black, White, Black 2 & White 2 features will go offline.
Game Sync will go offline on December 10th 2013.
The trial version of the Dream World will go offline on October 12th 2013, as will new user registration.
The GTS tracking for Gen V ends on January 14th 2014 and Rating Mode on Random Matchup goes offline on January 14th 2014.
The ability to do WiFi Memory Link in Black 2 & White 2 also goes offline on January 14th 2014.
C-Gear, Musical and Pokédex Skin changing deactivates on January 14th.
Waking up your Pokémon to get items and Pokémon also deactivates on January 14th. You will be able to wake your Pokémon up from the game side at any time, but the ability to do so from the Global Link deactivates on January 14th
However, using the GTS in the games, Free Rating in the Random Matchup and all the other in-game online features will continue.