A new online tournament for Pokémon Omega Ruby and Alpha Sapphire has been announced called the Scrappy Skirmish (Alternation Battle~オルタネーション バトル). Details of this tournament have been added to our 6th Generation Online Tournaments page and are also listed below.

Scrappy Skirmish

Region: International
Registration Period: Thursday, November 5, 2015, at 00:00 UTC through Thursday, November 12, 2015, at 23:59 UTC
Tournament Period: Friday, November 13, 2015, at 00:00 UTC through Sunday, November 15, 2015, at 23:59 UTC
Max number of participants: 50 000
Ranking Results Announcement: Late November, 2015
Player divisions: Junior/Senior Division: Born 2001 or later
Masters Division: Born 2000 or earlier
Compatible Games: Pokémon Omega Ruby and Pokémon Alpha Sapphire
Battle Type: Double Battle
Banned Pokémon: Players could use Pokémon with National Pokédex number 1 through 720, with the exception of the following: Mewtwo, Mew, Lugia, Ho-Oh, Celebi, Kyogre, Groudon, Rayquaza, Jirachi, Deoxys, Dialga, Palkia, Giratina, Phione, Manaphy, Darkrai, Shaymin, Arceus, Victini, Reshiram, Zekrom, Kyurem, Keldeo, Meloetta, Genesect, Xerneas, Yveltal, Zygarde, Diancie, and Hoopa. Furthermore, Pokémon that finished among the top 12 in previous 2015 Double Battle Online Competitions were not allowed and those Pokémon are listed in the chart below.
Players could use only Pokémon found, caught, hatched from an Egg, or received through a special promotion in Pokémon Omega Ruby, Pokémon Alpha Sapphire, Pokémon X, or Pokémon Y.
Pokémon brought over from Pokémon Black, Pokémon White, Pokémon Black 2, or Pokémon White 2 via Poké Transporter could not participate in this competition.
Entry Gift: 1,000 Poké Miles
The Scrappy Skirmish Online Competition was a format chosen by Pokémon fans around the world in a Pokémon Global Link poll. In the Scrappy Skirmish, players created a team and battled using only Pokémon that never cracked the top 12 in any 2015 Double Battle Online Competitions. All battles were Double Battles played in Pokémon Omega Ruby and Pokémon Alpha Sapphire. Players could not bring in Pokémon from earlier games via Poké Transporter.

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 50 during battles. A 20-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 battle up to 10 games per day of the competition. Any unplayed games would carry over to the following day.

Ineligible Pokémon that finished among the top 12 in previous 2015 Double Battle Online Competitions

003 — Venusaur 006 — Charizard 025 — Pikachu 094 — Gengar 115 — Kangaskhan 135 — Jolteon
171 — Lanturn 181 — Ampharos 245 — Suicune 248 — Tyranitar 272 — Ludicolo 282 — Gardevoir
303 — Mawile 310 — Manectric 373 — Salamence 405 — Luxray 445 — Garchomp 466 — Electivire
479 — Rotom 485 — Heatran 488 — Cresselia 587 — Emolga 591 — Amoonguss 596 — Galvantula
604 — Eelektross 618 — Stunfisk 625 — Bisharp 635 — Hydreigon 639 — Terrakion 642 — Thundurus
645 — Landorus 658 — Greninja 663 — Talonflame 681 — Aegislash 695 — Heliolisk 700 — Sylveon

Sources: http://3ds.pokemon-gl.com/information/035fa5f1-78e8-4801-865d-8ef2812d3bd1 and http://3ds.pokemon-gl.com/information/fcc89124-23d1-4d59-92c0-281234af390b