A new online tournament for Pokémon Omega Ruby and Alpha Sapphire has been announced called Spooky Cup (トリック・オア・トリート!?). Details of this tournament have been added to our 6th Generation Online Tournaments page and are also listed below.

Spooky Cup (トリック・オア・トリート!?)

Logo
Information
Region: International
Registration Period: Thursday, October 15, 2015, at 00:00 UTC through Thursday, October 22, 2015, at 23:59 UTC
Tournament Period: Friday, October 23, 2015, at 00:00 UTC through Sunday, October 25, 2015, at 23:59 UTC
Max number of participants: 50 000
Ranking Results Announcement: 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: All Pokémon except those 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.
Mega Stones could also not be used.
Entry Gift: 10 Rare Candies
Description
Players could complete in the Spooky Cup with the creepiest and most frightening Pokémon they could find! In this event, players created a team using only the Pokémon that were selected as the spookiest of all. All battles were Double Battles played in Pokémon Omega Ruby and Pokémon Alpha Sapphire.

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 15 games per day of the competition. Any unplayed games would carry over to the following day.

Elegible Pokémon for Spooky Cup

19 — Rattata 20 — Raticate 23 — Ekans 24 — Arbok 25 — Pikachu 41 — Zubat
42 — Golbat 46 — Paras 47 — Parasect 88 — Grimer 89 — Muk 92 — Gastly
93 — Haunter 94 — Gengar 104 — Cubone 105 — Marowak 109 — Koffing 110 — Weezing
114 — Tangela 122 — Mr. Mime 132 — Ditto 140 — Kabuto 141 — Kabutops 163 — Hoothoot
164 — Noctowl 167 — Spinarak 168 — Ariados 169 — Crobat 197 — Umbreon 198 — Murkrow
200 — Misdreavus 201 — Unown 207 — Gligar 210 — Granbull 215 — Sneasel 228 — Houndour
229 — Houndoom 262 — Mightyena 269 — Dustox 275 — Shiftry 292 — Shedinja 293 — Whismur
294 — Loudred 295 — Exploud 302 — Sableye 303 — Mawile 316 — Gulpin 317 — Swalot
318 — Carvanha 319 — Sharpedo 331 — Cacnea 332 — Cacturne 336 — Seviper 337 — Lunatone
343 — Baltoy 344 — Claydol 353 — Shuppet 354 — Banette 355 — Duskull 356 — Dusclops
359 — Absol 361 — Snorunt 362 — Glalie 425 — Drifloon 426 — Drifblim 429 — Mismagius
430 — Honchkrow 434 — Stunky 435 — Skuntank 442 — Spiritomb 451 — Skorupi 452 — Drapion
453 — Croagunk 454 — Toxicroak 461 — Weavile 465 — Tangrowth 472 — Gliscor 477 — Dusknoir
478 — Froslass 479 — Rotom 509 — Purrloin 510 — Liepard 527 — Woobat 528 — Swoobat
543 — Venipede 544 — Whirlipede 545 — Scolipede 550 — Basculin 552 — Krokorok 553 — Krookodile
561 — Sigilyph 562 — Yamask 563 — Cofagrigus 569 — Garbodor 570 — Zorua 571 — Zoroark
574 — Gothita 575 — Gothorita 576 — Gothitelle 592 — Frillish 593 — Jellicent 595 — Joltik
596 — Galvantula 605 — Elgyem 606 — Beheeyem 607 — Litwick 608 — Lampent 609 — Chandelure
623 — Golurk 634 — Zweilous 635 — Hydreigon 637 — Volcarona 677 — Espurr 678 — Meowstic
679 — Honedge 680 — Doublade 681 — Aegislash 687 — Malamar 708 — Phantump 709 — Trevenant
710 — Pumpkaboo 711 — Gourgeist 714 — Noibat 715 — Noivern

Sources: http://3ds.pokemon-gl.com/information/88e106ad-b235-4f70-95c4-9a2976fa0b7a and http://3ds.pokemon-gl.com/information/4f59b9bc-16e3-4516-8793-567ba335a318