The Special Battle rules for Rating Battle Season 9 have been revealed. Season 9 will run from March 13 to May 14, 2018, and runs on the original Pokémon Sun & Moon and Pokémon Ultra Sun & Ultra Moon, with rankings separate to each other. This rule set blocks usage of Mega Stones, Z-Crystals, Focus Sash and Eviolite and you can only select two Pokémon for the battle.
Battle type: Double Battle
Pokémon Restrictions: National Pokédex. No more than 1 of 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, and Marshadow.
The other standard rules apply, including all set to Level 50 if above that, and you choose two Pokémon out of your 6, and you cannot have two Pokémon holding the same hold item. Battles have a 10-minute duration, with turns having a 60 second timer.