The official Japanese Pokémon website has announced the Japan Cup 2014 (ジャパンカップ2014) will take place May 2nd, 2014 at 9:00 until May 5th, 2014 at 22:59.

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As the preliminary competition for the Pokémon World Championships 2014, the PGL Japan Cup 2014 will be held in Japan. The tournament helps with ranking people to decide who would represent Japan for the Pokémon World Championships held in Washington, DC.

Region: Japan
Registration Period: April 23rd, 2014 at 14:00 until May 2nd, 2014 at 8:59
Tournament Period: May 2nd, 2014 at 9:00 until May 5th, 2014 at 22:59
Battle Type: Double Battle
Pokémon Restrictions: Pokémon caught or hatched from eggs in Kalos
Banned Pokémon: All Pokémon not found in the Central Kalos, Coastal Kalos or Mountain Kalos Pokédexes, as well as Mewtwo, Xerneas, Yveltal, or Zygarde.

Details of this tournament have been added to our Pokémon X and Pokémon Y online tournament list.

Source: http://www.pokemon.co.jp/ex/wcs2014/game.html