The Special Battle rules for Season 5 have been revealed for Pokémon Sun and Moon. Season 5 will run from July 18, 2017, to September 18, 2017. This ruleset requires you to play a standard single battle, but this time it’s an Inverse Battle where the type chart has been reversed so Normal is Super Effective on Ghost etc.
Battle type: Single Battle
Pokémon Restrictions: National Pokédex.
Banned Pokémon: 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, Marshadow and Ash-Greninja
The other standard rules apply, including all set to Level 50 if above that, and you choose three Pokémon out of your six, and you cannot have two Pokémon holding the same hold item. Battles have a 10-minute duration, with turns having a 60-second timer. Pokémon need to be from the Pokémon X, Y, Omega Ruby, Alpha Sapphire, Sun or Moon games.