From October 15th, 2015 until November 3rd, 2015, a special Halloween Event will take place in the POKKÉN TOURNAMENT arcade game. Also the H01 update for the game includes improvements and fixes.

Halloween Event

There are three main parts to the Halloween Event:
Part 1: Players that use their BANAPASSPORT card unlock the ability to use the Mumage and Kyukon Support Pokémon set. Players will also randomly receive avatar items, titles and PokéGold throughout the event.
Part 2: Players that login to the Pokken Link website can unlock the costume in the game that Nia (ニア) is wearing throughout the event.
Part 3: The Haunted House stage will be decorated for Halloween.

Sources: http://app.pokkentournament.jp/top/news/detail/index/news_id/jX15bwtcJW0wvkf-ugGi5A and http://www.pokkentournament.jp/news/index.html#news1