art
Premise
All forms of passive damage now equal the first type of the Pokemon that set them first and deal damage based on the effectiveness of the passive damage on the target. For example, a Dragon-type Stealth Rock deals no damage to pure Fairy-types. Abilities like Mold Breaker and Water Absorb do not impact the damage dealt by these.
Clauses & Bans
Clauses: Standard OMs, Sleep Moves Clause, Evasion Items Clause
Pokemon:
Items: Heat Rock, King's Rock, Razor Fang, Quick Claw
Moves: Baton Pass, Last Respects, Shed Tail
Explanation
Passive damage (any form of damage that would be blocked by Magic Guard) now deals damage based on the inflictor's primary type. This includes ability-based passive damage like Rough Skin, as well as self-inflicted passive damage like Life Orb. Some more in-depth examples below:
Rough Skin/Iron Barbs/Rocky Helmet
In standard play, if Pokemon A comes into contact with Pokemon B with Rough Skin, Pokemon A loses 1/8 of their max HP. In this OM, Say Pokemon B is Sharpedo and Pokemon A is 4x weak to Water, Pokemon A loses 1/2 of their max HP after coming into contact with Sharpedo. 2x weak = 1/4 max HP, 2x resist = 1/16 max HP, 4x resist = 1/32 max HP. The same applies to Iron Barbs and Rocky Helmet.
Bad Dreams
Bad Dreams now deals damage to sleeping Pokemon based on how weak they are to Dark. If Darkrai puts a Hoopa to sleep, the Hoopa would lose 1/2 of its max HP at the end of each turn while sleeping.
Sand Stream
Sand set by Sand Stream triggered by Hippowdon deals Ground type residual damage at the end of each turn. Pokemon 4x weak to Ground lose 1/4 of their max HP at the end of each turn, 2x weak to Ground = 1/8, neutral = 1/16, 2x resist = 1/32, 4x resist = 1/64. Similarly, sand set by Sand Stream triggered by Tyranitar deals Rock residual damage at the end of each turn with the same proportions as Hippowdon. Players can't override one sandstorm with another, similar to in standard play.
Spikes
Spikes still does varying damage per layer, but the damage per layer will be based on the effectiveness of the type of the first layer of Spikes set. This means if the First layer of Spikes are Grass, all layers will be Grass until they get cleared and re-set. For reference, one layer of spikes = 1/8 max HP on a neutral target, two layers = 1/6 max hp, three layers = 1/4.
Levitate/Flying-types
Since Spikes has a separate check to see if a Pokemon is grounded, Flying-types and Pokemon with Levitate are still immune to Spikes.
Poison Heal
Poison Heal still operates like normal.
Life Orb
The recoil from Life Orb is also based on the holder's primary type, so Pokemon with Dragon or Ghost as their primary type are horrible options to hold Life Orb, since they lose 1/5 of their max HP at minimum, assuming their secondary type doesn't cancel out the weakness.
Black Sludge
Black Sludge will still not deal any damage if a Pokemon is at least part Poison. Otherwise, the damage at the end of each turn is type-based. Same for Sticky Barb.
Burns/Normal Poison
Burns also deal damage based on the type of the Pokemon that inflicted the burn. However, moves that inflict burn themselves remain their default type. Same for normal poison.
Toxic Poison
Toxic still ramps up its damage each turn, multiplied by the effectiveness on the badly poisoned Pokemon. This means Toxic from a Grass-type on a Pokemon 4x weak to Grass will take 1/4 damage on the first turn.
Salt Cure
Salt Cure will do (1 * x) / y, where x = the target Pokemon's effectiveness to the Salt Cure user's primary type's effectiveness on the target Pokemon, and where y = 8 is the Pokemon is not Water or Steel, or y = 4 otherwise. That means Garganacl's Salt cure on a pure Steel-type would be (1 * 0.5) / 4 = 1/8 max HP every turn.
Magic Coat/Magic Bounce
Moves bounced by Magic Coat/Bounce are considered moves that get used by the Pokemon with that move/ability, so a burn from a Will-O-Wisp that gets reflected will use the primary type of the bouncer.
Council
dhelmise
kenn
Gimmicky
Premise
All forms of passive damage now equal the first type of the Pokemon that set them first and deal damage based on the effectiveness of the passive damage on the target. For example, a Dragon-type Stealth Rock deals no damage to pure Fairy-types. Abilities like Mold Breaker and Water Absorb do not impact the damage dealt by these.
Clauses & Bans
Clauses: Standard OMs, Sleep Moves Clause, Evasion Items Clause
Pokemon:
Arceus (all formes)
Baxcalibur
Calyrex-Ice
Calyrex-Shadow
Chi-Yu
Chien-Pao
Deoxys-Attack
Deoxys-Normal
Dialga
Dialga-Origin
Eternatus
Flutter Mane
Gholdengo
Giratina
Giratina-Origin
Gouging Fire
Groudon
Ho-Oh
Iron Bundle
Koraidon
Kyogre
Kyurem
Kyurem-Black
Kyurem-White
Lugia
Lunala
Magearna
Mewtwo
Miraidon
Necrozma-Dawn-Wings
Necrozma-Dusk-Mane
Ogerpon-Hearthflame
Palafin
Palkia
Palkia-Origin
Raging Bolt
Rayquaza
Reshiram
Shaymin-Sky
Sneasler
Solgaleo
Zacian
Zacian-Crowned
Zamazenta-Crowned
Zekrom
Items: Heat Rock, King's Rock, Razor Fang, Quick Claw
Moves: Baton Pass, Last Respects, Shed Tail
Explanation
Passive damage (any form of damage that would be blocked by Magic Guard) now deals damage based on the inflictor's primary type. This includes ability-based passive damage like Rough Skin, as well as self-inflicted passive damage like Life Orb. Some more in-depth examples below:
Rough Skin/Iron Barbs/Rocky HelmetIn standard play, if Pokemon A comes into contact with Pokemon B with Rough Skin, Pokemon A loses 1/8 of their max HP. In this OM, Say Pokemon B is Sharpedo and Pokemon A is 4x weak to Water, Pokemon A loses 1/2 of their max HP after coming into contact with Sharpedo. 2x weak = 1/4 max HP, 2x resist = 1/16 max HP, 4x resist = 1/32 max HP. The same applies to Iron Barbs and Rocky Helmet.
Bad DreamsBad Dreams now deals damage to sleeping Pokemon based on how weak they are to Dark. If Darkrai puts a Hoopa to sleep, the Hoopa would lose 1/2 of its max HP at the end of each turn while sleeping.
Sand StreamSand set by Sand Stream triggered by Hippowdon deals Ground type residual damage at the end of each turn. Pokemon 4x weak to Ground lose 1/4 of their max HP at the end of each turn, 2x weak to Ground = 1/8, neutral = 1/16, 2x resist = 1/32, 4x resist = 1/64. Similarly, sand set by Sand Stream triggered by Tyranitar deals Rock residual damage at the end of each turn with the same proportions as Hippowdon. Players can't override one sandstorm with another, similar to in standard play.
SpikesSpikes still does varying damage per layer, but the damage per layer will be based on the effectiveness of the type of the first layer of Spikes set. This means if the First layer of Spikes are Grass, all layers will be Grass until they get cleared and re-set. For reference, one layer of spikes = 1/8 max HP on a neutral target, two layers = 1/6 max hp, three layers = 1/4.
Levitate/Flying-typesSince Spikes has a separate check to see if a Pokemon is grounded, Flying-types and Pokemon with Levitate are still immune to Spikes.
Poison HealPoison Heal still operates like normal.
Life OrbThe recoil from Life Orb is also based on the holder's primary type, so Pokemon with Dragon or Ghost as their primary type are horrible options to hold Life Orb, since they lose 1/5 of their max HP at minimum, assuming their secondary type doesn't cancel out the weakness.
Black SludgeBlack Sludge will still not deal any damage if a Pokemon is at least part Poison. Otherwise, the damage at the end of each turn is type-based. Same for Sticky Barb.
Burns/Normal PoisonBurns also deal damage based on the type of the Pokemon that inflicted the burn. However, moves that inflict burn themselves remain their default type. Same for normal poison.
Toxic PoisonToxic still ramps up its damage each turn, multiplied by the effectiveness on the badly poisoned Pokemon. This means Toxic from a Grass-type on a Pokemon 4x weak to Grass will take 1/4 damage on the first turn.
Salt CureSalt Cure will do (1 * x) / y, where x = the target Pokemon's effectiveness to the Salt Cure user's primary type's effectiveness on the target Pokemon, and where y = 8 is the Pokemon is not Water or Steel, or y = 4 otherwise. That means Garganacl's Salt cure on a pure Steel-type would be (1 * 0.5) / 4 = 1/8 max HP every turn.
Magic Coat/Magic BounceMoves bounced by Magic Coat/Bounce are considered moves that get used by the Pokemon with that move/ability, so a burn from a Will-O-Wisp that gets reflected will use the primary type of the bouncer.
Council
dhelmise kenn Gimmicky
isn't banned... It's pretty unique for having both a damaging hazard and a 25% self damage Steel Beam
, Comfey, 
, Electrode-Hisui 
, and among other lower tier mons Calyrex 
with the funny Psychic Leech. Also Meowscarada 
can potentially apply a decent variety of types through both Leech Seed and Spikes thanks to Protean. 
is also menacing with Spikes. Fairy Rocks are definitely a thing to look out for, but with no Fairy Spikes users aside from Meowscarada after using Play Rough, I think Dark will be very scary as far as Spike types go.
named Lysithea :)
was cooked, how does Pain Split and Substitute work? Does Reuniclus only use 12.5% of HP to make a Substitute? Does Pain Split deal Psychic-Type "damage"?
The only user of Ghost Spikes due to Protean
Curse? If it applies Curse, and the opponent is 
does Curse just OHKO it due to being a "Ghost" Curse?
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Bind
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Thunder Cage
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