Register now for the 2013 International Challenge—January, a new online tournament hosted at the Pokémon Global Link. Space is limited, so be sure to register as soon as possible. Registration officially closes at 23:59:00 UTC on Thursday, January 24th, unless the player cap is reached before then. The tournament starts at 0:00:00 UTC on Friday, January 25th. You’ll have until 23:59:00 UTC on Monday, January 28th, to win as many battles as you can!
Full article from Pokemon.com