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Looks like this slipped past the radar with all the shitposting today.
>The Special Battle rules for Season 2 have been revealed. Season 2 will run from January 17th 2017 to March 19th 2017 and runs on Sun & Moon. This ruleset alters things to allow for the inclusion of Pokémon through the National Pokédex after the release of Bank later this month The base rules for this season are as follows:
>Battle type: Single Battle
>Pokémon Restrictions: National Pokédex.
>Banned Pokémon: Only 1 of the following can be used per team: 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, Hoopa, Volcanion, Cosmog, Cosmoem, Solgaleo, Lunala, Necrozma, Magearna
In the very least, if it's not the 17th (which is a Tuesday), it'd likely come on the Thursday eshop update.