Pokémon.com have announced the latest in their Wi-Fi tournaments held through the Pokémon Global Link. This tournament goes by the name of 2013 International Challenge: January and as the name suggests it will be putting you against trainers from across the world. The tournament will once more be using the VGC13 rules, which is basically just the Global Battle Union Double battle rules.
Sign-ups for the tournament will open on the 17th of January and close on the 24th, with the tournament then running from the 25th of January until the 28th. To take part you need an account on the Pokémon Global Link and a copy of either Pokémon Black 2 or Pokémon White 2.