The Japanese Pokémon Global Link website has announced the two latest online tournaments for X and Y.

Hoenn Pokémon NicoNico Match (ホウエンポケモン ニコニコマッチ)

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Information
Region: Japan
Registration Period: October 2nd, 2014 at 14:00 until October 10th, 2014 at 8:59 JST
Tournament Period: October 10th, 2014 at 9:00 until October 14th, 2014 at 8:59 JST
Ranking Results Announcement: Friday, October 17th, 2014
Max number of participants: 50 000
Player divisions: Junior Division: Born in 1996 or later
Masters Division: Born in 1995 or earlier.
Battle Type: Double Battle
Pokémon Restrictions: Only Hoenn Pokémon with National Dex id's of 252 to 384 could be used. Groudon, Kyogre and Rayquaza could be used but only one per battle box.
Entry Gift: 2525 PokéMiles
Description
To celebrate the launch of Pokémon Omega Ruby and Alpha Sapphire, this competition was held for players of Pokémon X and Y.

The competition used the Double Battle format and players could register 4 to 6 of their level 1–100 Pokémon to their Battle Box. Pokémon automatically became Level 25 during battles. A 25-minute time limit for each match was automatically enforced in-game, beginning at the start of each battle. If the outcome had not been determined when the time limit expired, the game automatically applied tiebreakers to determine a winner. At the beginning of each battle, players had 25 seconds to select their Pokémon to battle with. At the beginning of each turn, players had 25 seconds to select a move or change Pokémon in battle. If a player had not made his or her selections at the end of this period, the game automatically made selections for the player. Players could only play 25 rounds per day.


Halloween Party (ハロウィンパーティー)

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Information
Region: International
Registration Period: October 16th, 2014 at 14:00 until October 24th, 2014 at 8:59 JST
Tournament Period: October 24th, 2014 at 9:00 until October 27th, 2014 at 8:59 JST
Ranking Results Announcement: Friday, October 31st, 2014
Max number of participants: 50 000
Player divisions: Junior Division: Born in 2000 or later
Masters Division: Born in 1999 or earlier.
Battle Type: Single Battle
Pokémon Restrictions: Any National Dex Pokémon from 1 to 719 with a Ghost type, excluding Rotom and Giratina. Pumpjin (パンプジン) was required. Players could use only Pokémon found, caught, hatched from an Egg, or received through a special promotion in Pokémon X or Pokémon Y. Pokémon brought over via Poké Transporter could not participate in this competition.
Entry Gift: 5 Rare Candy
Description
To celebrate the Halloween season, this tournament featured Pumpjin (パンプジン) which was required to be used by all participant.

The competition used the Single Battle format and players could register 3 to 6 of their level 1–100 Pokémon to their Battle Box. Pokémon automatically became Level 50 during battles. A 30-minute time limit for each match was automatically enforced in-game, beginning at the start of each battle. If the outcome had not been determined when the time limit expired, the game automatically applied tiebreakers to determine a winner. At the beginning of each battle, players had 90 seconds to select their Pokémon to battle with. At the beginning of each turn, players had 60 seconds to select a move or change Pokémon in battle. If a player had not made his or her selections at the end of this period, the game automatically made selections for the player. Players could only play 10 rounds per day.

Source: http://3ds.pokemon-gl.com/information/3dc40686-8fc6-4de2-9731-2a9746d3fb0a and http://3ds.pokemon-gl.com/information/6d363ae6-a026-44c5-a161-db4916bf9b4d