Resource Random Battles Changelog

[Tarrembeau]

January 22, 2023:

• In Gen 1, Tangela has been fixed in order to always roll Sleep powder. It can now also get Stun Spore.
• In Gen 2: Rapid Spin can no longer generate on the same set as Curse. Several movepools have been changed, see details here.
• In Gen 3: Latias can get a mono-attacking Refresh set, and Aipom can now get Thunder Wave. See other movepool changes here and here.
• In Gen 5:
  • Reflect and Light Screen now usually generate together.
  • guarantee Icicle Spear on Shell Smash Cloyster.
  • Banette can get a Choice Band set with Trick.
  • Kyogre and Typhlosion can now get Choice Specs as their item.
  • Calm Mind mono-Psychic types shouldn't have Shadow Ball as their only coverage.
  • And some minor set changes you can find in this commit.
• In Gen 6 and Gen 7: 4 attacks mixed attackers can now generate Expert belt if they have one Dark-type move that is not Sucker punch.

 

[Tarrembeau]

January 25, 2023:

In Gen 4:

• Pikachu with Light Ball has been added to the format.
• Yanmega will no longer get Protect with Leftovers and Tinted Lens.
• Farfetch'd will now get a choice item when rolling four attacking moves.
• Hitmonchan and Hitmonlee will now be able to roll Mach punch.
• Drapion will now always have a Dark stab.
• Light Screen and Reflect should now usually appear together, if they are both in a Pokemon's movepool.
• Wish and Toxic should now be rolled alongside Protect if the Pokémon has both moves in its movepool.
• Several sets have been updated. See more detail here.

 

[A Cake Wearing A Hat]

January 29, 2023:
- There now exists a list of Pokemon that have their priority move forced, but don't have their usual STAB of that type forced in its place. For example, Breloom always gets Mach Punch, but doesn't always get Close Combat.
-- This list is: Banette, Breloom, Lycanroc-Dusk, Giratina-Origin, Brute Bonnet, Cacturne, Mimikyu, and Scizor.

- Spiritomb will actually always get infiltrator now, for real.
- Dudunsparce will always get Rattled on its Boomburst set.
- Salt Cure now always appears on Bulky Support Garganacl, and Stone Edge does not always appear on it anymore.
- Basculegion (both formes) now always runs a Choice Scarf.
- Magearna was given Shift Gear on its Calm Mind set solely for the reason of "blending in" with the Weakness Policy set, for purposes of unpredictability. This is technically unnecessary but deemed more useful than keeping Agility.
- A few Tera types and sets were changed, visible here.

 

[Tarrembeau]

January 30, 2023:

• In Gen 2: Ditto will now always have metal powder as its item.
• In Gen 4: many movepools have been updated, see detailed changes here.

As a side note, in Gen 2 to Gen 4, Pokémons can now generate set up moves with fewer attacks if Baton Pass is in the set.

• In Gen 5:
  • Sceptile is changed to get a more consistent Swords Dance set.
  • Pokemon with 3 Dark attacks will get Black Glasses as their item.
  • Cherrim-Sunshine is removed from the format for real now.
  • Castform is now level 100.
• In Gen 6 and Gen 7:
  • Pinsir-Mega won't get Close Combat and Earthquake together.
  • Wish/Protect will now usually appear together.
  • Castform is now level 100.
  • Several movepools have been updated. See more detail here.

 

[Tarrembeau]

February 9, 2023:

• In Gen 3:
  • Rolling three physical attacks + Fire blast will now allow Choice Band to be generated
• In Gen 4:
  • Mismagius will now be able to sometimes roll Choice items with Trick
  • Umbreon can now get Wish + Moonlight, but not with Protect
  • Ditto will now get Salac Berry or Sitrus Berry
  • Pidgeot and Fearow will now be able to generate a Life Orb set with Heat Wave
• In Gen 5:
  • Dugtrio will now have a fixed set with Life Orb
• In Gen 6:
  • Kangaskhan-Mega will no longer get Seismic Toss with Power-Up Punch
  • Cloyster should always get Icicle Spear with Shell Smash
  • Cherrim-Sunshine has been removed from the format
  • Focus Sash bulk threshold for being generated on a lead Pokemon has been reduced from under 275 total defensive BST, to under 255 defensive BST.
• In Gen 7:
  • Reshiram should always generate Blue Flare
• In both Gen 6 and Gen 7:
  • Pokemon with Rock Head/Water Absorb as possible abilities will never get Swift Swim as their ability, unless they have Rain Dance in their set
  • Dustox will no longer get Quiver Dance + U-Turn
  • Slow Pokemon (< 90 base speed) will no longer get Life Orb with Volt Switch

In addition to these changes, many sets were changed across all these five formats. You can find more details here.

 

[A Cake Wearing A Hat]

Gen 9 Random Battle:
2/1/2023:
Level balancing occurred based on the win rates that you can see using the "/rwr" command. Pokemon with high win rates got a level drop, and pokemon with low win rates got a level buff, based on January's stats.

A full list of level changes is visible here.

2/12/2023
-Revamped most arceus sets
-Removed Tera Blast User Tatsugiri and Sylveon; in their place, Ghost Tera Blast Falinks (which can switch out!) and Ground Tera Blast Florges will now exist.
-New framework exists for the existence of bulkier Tera Blast users. Tera Blast users with a recovery move and 2 attacks will get Leftovers instead of the usual Life Orb. This currently only affects Florges but can affect other Pokemon in the future.
-Wet Tauros can now roll Raging Bull, but its other water moves are incompatible with it.
-Special Toxicroak was removed in an attempt to increase its win rate.
-Moves are shuffled now instead of always generating STABs in slots 1 and 2 both for aesthetic purposes and to improve Camomons Mod.
-Many other set changes.

A full list of changes is visible here.

 

[Tarrembeau]

February 20, 2023:

• In Gen 4: Persian will get Return instead of Swift on sets without Nasty Plot.
• In Gen 5:
  • non-choiced Palkia will get Lustrous Orb if it has Draco Meteor or Spacial Rend.
  • Wood Hammer is now enforced on Grass type Pokemons.
• In Gen 6: Diancie-Mega will always get Moonblast, and Malamar will always get Superpower.
• In Gen 6 and Gen 7:
  • Gyarados and Mega-Gyarados won't get Substitute unless they also have Dragon Dance.
  • Normal types Pokemons with Fake Out and another Normal type attack will now get Silk Scarf.
• In Gen 8 BDSP: Jirachi's movepool have been revamped completely. See more detail in this commit.

Additionally, in Gen 4, Gen 6 and Gen 7, Wish/Protect enforcement has been improved. Most Pokemon with Wish and Protect in their movepool won't get Protect without Wish, and Wish will generally appear more often on them.

 

[A Cake Wearing A Hat]

February 19, 2023:

-Iron Valiant now runs a mixed Calm Mind set, and no longer runs Choice Specs
-Hoopa-Unbound now runs a mixed Choice Scarf set, and no longer runs fully special Choice Scarf.
-Enamorus-Therian no longer runs mixed Choice Specs, this was a bug.
-Inteleon will no longer get Sniper.
-Annihilape will no longer get Choice items.
-Scream Tail will no longer get screens, hopefully cutting down on the whole "double screeners" issue.
-Lilligant and Inteleon have new additional Tera Blast types.
-Glaceon can now run Yawn instead of Calm Mind sometimes.
-Minor updates to Tera types of the above Pokemon, visible here.

 

[A Cake Wearing A Hat]

February 26, 2023:

February's monthly win rates (visible via the /rwr command) have been used to balance levels for many Pokemon. Exact level changes are visible by loading the differences in random-sets.


-Defiant Kingambit and Corrosion Glimmora are gone.
-Glimmora will now always have Earth Power
-Electromorphosis will now appear 2/3 of the time on Bellibolt, instead of 1/2.
-Arceus-Steel can now get mono-attacking CM Wisp and pure support 2 attacks wisp sets.
-Monthly level adjustments based on winrates.
-Decidueye-Hisui: -Tera Fighting, now only Tera Steel
-Iron Hands: -Tera Fighting, now only Tera Electric
-Magnezone: -Steel Beam; non-Tera Blast can no longer run Choice Specs
-Passimian: +Earthquake
-Slaking is now a fixed set of two normal moves, Earthquake, and Throat Chop.
-Alolan Raichu's tera types are now Grass/Water/Fighting.

 

[A Cake Wearing A Hat]

2/27:

Iron Leaves and Walking Wake have been added to Random Battles.

 

[A Cake Wearing A Hat]

3/5:

-Protect users will no longer have Focus Sash.
-Added Sunny Day life Orb Walking Wake.
-removed Raging Bull Wet Tauros because statistics showed it to be unhelpful to its effectiveness
-added Tera Ghost Mewtwo again; this may be temporary.
-Other minor tera type updates visible here.


3/11

An effort to reduce the frequency of choice items in the format is being executed. Hopefully some of the changes here will help with the frequency of getting 3+ choiced pokemon in a game. Changes made with this goal in mind are marked with an asterisk (*)


-Volcanion will now get Haze, and therefore Boots. It will not generate Haze with Flame Charge. *
-Iron Thorns and Landorus-Therian will no longer get Focus Sash.
-Iron Leaves will now always get Psyblade on its Swords Dance set (Wild Charge was removed)
-Lokix no longer gets Boots. Instead, the U-turn set gets Silver Powder, while the other sets get Life Orb.
-Slowking, Mesprit, and Dialga no longer get Trick, but can still get Choice items at a lower rate than previously. *
-Mesprit can no longer get both Healing Wish and U-turn on the same set. *
-Choice item Falinks no longer exists. *
-Hisuian Electrode now has Leaf Storm instead of Chloroblast; now, not all sets will have Energy Ball.
-Glastrier does not need Crunch. *
-Hoopa-Unbound was deemed ineffective with Nasty Plot, so its fully special set was removed.
-Tinkaton can now use Encore.
-Physical Lucario now only has Normal tera, which forces all sets to have Extreme Speed.
-Staraptor now only has Fighting tera, which forces all sets to have Close Combat.
-Orichalcum Pulse now counts as having sun, so you will now get sun-synergistic abilities like Chlorophyll on your team with Koraidon when available.
-Physical Mew now always has Swords Dance and no longer runs Choice items or Dragon Dance. It has also gained Leech Life and will always have Close Combat. *
-Bulky Support Mesprit now exists as a second set. *
-Noivern's Fast Support set has become a Tera Steel Bulky Attacker set with no Hurricane; it will now always have Roost on this set and will have Defog more often than before. *

 

[A Cake Wearing A Hat]

3/19:

-Calm Mind Arceus-Fighting was added for additional variety and unpredictability, as well as in an attempt to better its win rate.
-Ice Beam was removed from Magearna to reduce the frequency of Choice items.
-Brambleghast's Tera types now the same across both sets.
-Slaking can now run Tera Ghost.
-Espathra can now run Tera Blast fighting.
-Haxorus can now run Tera Steel, and it gets Iron Head instead of Poison Jab.

3/26:

-Substitute users will always get Soundproof when possible (Hisuian Electrode)
-Garchomp can get Spikes now.
-Farigiraf has gained Tera Normal on its Future Sight WishTect set.
-Cloyster is no longer a Tera Blast user, and instead uses Tera Ground Drill Run.
-Hyper Voice will now always appear on Normal-types that can run it.
-Arboliva now gets Ground Tera as an option to compensate for forced Hyper Voice decreasing the rate of Earth Power.
-Hisuian Zoroark can now also use Tera Fighting, and will get Focus Blast more often.
-Sandy Shocks can now run a Choice item Tera Blast set. It is Tera Flying or Ice.

 

[A Cake Wearing A Hat]

4/1:

Moody was removed from Random Battles. Glalie is now Level 94 with Spikes, Taunt, Disable, Earthquake, and Ice Beam. Scovillain is now level 90 and either runs a Choice item or its usual SubSeed set, but with Chlorophyll.

Hisuian Zoroark is now limited to levels 72-86. Zoroark is now limited to levels 76-94.

4/9: (Big Update)

-Vigoroth will now exist in Random Battles. It is starting at level 88, with Bulk Up, Slack Off, Body Slam, and one of Earthquake or Throat Chop, with Ground or Ghost Tera Types.

-Pokemon prevented from being leads will no longer be less common than other Pokemon who can be leads.
--- Rillaboom can no longer be a lead. Grassy Seed Lead Rillaboom, and, well, every other lead Rillaboom, is no more.

-Teams will no longer have more than two Spikes or Toxic Spikes users, in most scenarios.

-Unless they have setup moves or a Wallbreaker role, Pokemon will now still get Heavy-Duty Boots if the team has hazard removal. No more Air Balloon Coalossal, for instance.

-Setup Sweeper Hisuian Lilligant will now always have Victory Dance. Whoops!

-Tera Blast Magnezone, and by extension Specs Magnezone, will no longer exist.
---Tera Blast Ground/Water Volcarona now exists to make up for it.

-Klawf now has a separate Swords Dance set. It will run Anger Shell only, with Rindo Berry, Passho Berry, Sitrus Berry, or Scope Lens at random as its item. Its previous set will now always be Regenerator and does not have Swords Dance.

-Annihilape's second set is improved. Close Combat has been replaced with Drain Punch, Tera Types now match those of the Rest set, and Gunk Shot and Taunt are new fourth move options.

-Choice Scarf Cyclizar will no longer exist, but the Heavy-Duty Boots set can now sometimes run Knock Off over Taunt. Also, it can now get Steel and Ghost Tera Types.

-Assault Vest Garganacl is being replaced with Salt Cure + Protect Garganacl.


As well as other, smaller changes:
-Swords Dance Swalot: +Tera Grass.
-Electrode: -Light Screen.
-Spidops: -Memento, +U-turn; Insomnia no longer generates.
-Glalie: -Ice Beam, +Freeze Dry.
-Articuno: -Tera Poison, because statistical analysis showed this addition was detrimental.
-Farigiraf: -Tera Normal, because statistical analysis showed this addition was detrimental.
-Gholdengo: +Steel Tera again, because statistical analysis showed that its removal didn't help its winrate.
-Bulky Support Garganacl: -Avalanche
-Curse Garganacl: +Tera Fairy, Dragon
-Skeledirge: +Roar, +; Flame Charge Skeledirge is now less common as a result. The Teras on both sets are now Ghost/Water/Fairy.
-Delphox: -Switcheroo, +Focus Blast, +Tera Grass, +Tera Fighting; Choice Specs Delphox can now exist.
-Pincurchin: -Liquidation, +Hydro Pump
-Oricorio formes will no longer run Substitute, and their sets were fused so that they will no longer generate as a second Defogger on a team that already has a Defogger. This slightly increases the frequency of Quiver Dance.
-Sheer Force Hisuian Braviary: -Defog, -Tera Flying, +Agility, +Tera Steel/Fairy/Fire
-Tinted Lens Hisuian Braviary: -Tera Flying, +Defog, +Tera Steel/Fairy; Choice Specs and Calm Mind will be slightly less common as a result.
-Ting-Lu: +Tera Poison
-Persian: +Bite; Bite and Foul Play will not generate together.

 

[A Cake Wearing A Hat]

4/16:

-Support Mew: +U-turn
-Special Mew: +Hydro Pump, +Tera Water
-Oinkologne (both): +Double Edge; cannot get both normal moves
-Nuzzle Pawmot now gets Leppa Berry.
-Slowking now has a third set of Chilly Reception, Future Sight, Slack Off, and Surf
-Dragalge: +Tera Fighting, +Tera Electric, -Tera Poison
-Venomoth: +Tera Steel, +Tera Water
-Fast Attacker Azelf: -Energy Ball, +Thunderbolt, +Tera Electric

4/23:

-Dragon Tail was removed from Goodra because statistical analysis showed that it was made worse.
-Calm Mind Arceus-Fighting was removed because statistical analysis showed that it was made worse.
-Staraptor no longer always has Close Combat, and it can now run Tera Flying, because statistical analysis showed that forcing Tera Fighting made Staraptor worse.
-Skeledirge's recent changes were reverted because statistical analysis showed it was made worse.


-Torkoal: -Tera Fire, +Tera Grass; Its role is now Bulky Attacker. This forces Solarbeam with Tera Grass, but it prevents Lava Plume + Rapid Spin + Stealth Rock + Yawn Torkoal from existing.
-Coil Eelektross: -Tera Electric; it now always has Drain Punch.
-CM Spiritomb: -Tera Dark
-Pincurchin: -Tera Electric, +Tera Ghost
-Giratina: +Tera Fairy


-Tidy Up Maushold will no longer prevent other hazard removers from generating.

 

[A Cake Wearing A Hat]

4/30:

-Toxtricity-Low-Key and Toxtricity have been merged into just Toxtricity, to make it more unpredictable. Toxtricity-Low-Key was removed, and Toxtricity now also gets Toxic Spikes.

-Level balancing has occurred for gens 3, 4, 5, 6, 7, and 9.

-Latias and Latios have been retooled to include Soul Dew in generations 3-6.

https://github.com/smogon/pokemon-showdown/pull/9544/files

 

[A Cake Wearing A Hat]

5/11:

We have another goal in mind with many of our small changes: increasing how well teams can deal with hazards. Changes made to help with that goal are marked with an asterisk (*).


-Giratina now has a third set; its first set is now Fast Support instead of Bulky Support (no functional change), and the new set is Bulky Support featuring Defog, Dragon Tail, Will-O-Wisp, Shadow Ball, and Rest, without Sleep Talk. This set will run either a Chesto Berry or Leftovers, depending on whether or not it gets Rest.*
-Iron Treads: -Stone Edge (and therefore no longer runs Choice items)*
-Kingambit: -Stealth Rock; role changed to Bulky Attacker to give it Leftovers instead of Life Orb*
-Flamigo: Role changed to Fast Attacker; it can now get Choice Scarf.
-Sandy Shocks set 1: +Tera Bug, Role changed to Fast Support to give it Heavy-Duty Boots with Volt Switch*
-Meowscarada: Role changed to Fast Support to give it Heavy-Duty Boots on U-turn/Toxic Spikes/Knock Off/Flower Trick sets. Life Orb and Choice Band will still exist.*
-Lumineon: Role changed to Fast Support to give it Heavy-Duty Boots on U-turn + Encore sets. Life Orb and Choice Specs will still exist.*
-Brambleghast: The roles for its two sets have been switched, which allows Brambleghast to get Heavy-Duty Boots with Rapid Spin, though it will no longer always run Strength Sap on that set.*
-Grafaiai: The roles for its second and third set have been switched, which allows Parting Shot Grafaiai to get Heavy-Duty Boots.*
-Chilly Reception and Mortal Spin now grant Heavy-Duty Boots. Assault Vest Glimmora will continue to exist on Mortal Spin + 3 other attacks sets.*
-Alomomola and Amoonguss now have a 50% chance to run Rocky Helmet instead of Leftovers. Slowbro and Toxapex now have a 50% chance as well, up from 33%.
-Scyther will no longer get Swords Dance + U-turn together.
-Spidops will now always run Circle Throw.


-Avalugg-Hisui: -Curse, +Rapid Spin*
-Lycanroc-Dusk: -Drill Run
-Ursaluna: -Protect, +Trailblaze
-Inteleon set 1: -Air Slash
-Clodsire set 2: -Spikes, +Stealth Rock*
-Whiscash set 1: -Liquidation, -Stone Edge, +Hydro Pump, +Ice Beam
-Hoopa: -Substitute (and therefore it will no longer run Leftovers)
-Scizor set 2: +U-turn, role changed to Fast Attacker (and therefore Scizor will now be 50% Defog, 25% Swords Dance, and 25% Choice Band.)
-Dragalge: -Thunderbolt, Tera Elec, and Tera Dragon, +Hydro Pump and Tera Water
-Articuno: -Tera Flying
-Muk: -Tera Poison, +Tera Dragon
-Corviknight: +Tera dragon
-Iron Hands: +Tera Fighting
-Oricorio-Pa'u: +Tera Fighting
-Typhlosion: -Tera Ghost, +Tera Fighting

 

[A Cake Wearing A Hat]

Sorry for the while without Changelog updates, i was away! Thanks to livid washed for doing updates while i've been gone.

Changes that help with the goal of reducing the frequency of choiced items are marked with (*). Changes that help with the goal of bettering hazards management are marked with (†).

5/22:


-changed Noivern's support set back to Fast Support (i.e., it can no longer get Roost + Defog), because statistical analysis showed that it was made worse. (†?)
-Dondozo: -Liquidation
-Zoroark: +Psychic
-Meowscarada: -Thunder Punch, +Play Rough
-Vespiquen: +Hurricane (50/50 with Air Slash)
-Breloom: -Close Combat, +Tera Rock (no longer runs Choice Band) *
-Fast Bulky Setup Tauros-Combat: +Tera Steel
-Fast Bulky Setup Tauros-Blaze: -Tera Fire, +Tera Water
-Fast Bulky Setup Tauros-Aqua: +Tera Steel
-Specs Dragapult: +Tera Fire
-Hippowdon: -Tera Fairy, +Tera Dragon
-Support Scizor: +Tera Dragon
-Camerupt: +Tera Grass


Technical:
-Set damage moves shouldn't count as moves of that type (e.g. Ruination no longer counts as a Dark type attack).

5/30:
Level balancing occurred. Hisuian Zoroark's maximum level is now 84.

6/5:
-Teams are less likely to have more than one dual screener; if a dual screener already exists and a potential dual screener has 6 or more moves in its pool, then both screens will be removed from its pool.


-Cresselia, Calyrex: -Psychic
-Sandy Shocks: -Tera Bug, +Tera Grass
-Blissey: -Stealth Rock, +Heal Bell, +Shadow Ball, enforce Seismic Toss
-Mewtwo and Mew's special set: -Shadow Ball, -Tera Ghost, +Dark Pulse, +Tera Dark
-support Mew: -Spikes, -Thunder Wave, +Encore †
-Gothitelle: -Shadow Ball, -Nasty Plot, +Calm Mind, +Dark Pulse, +Tera Dark, Fairy, Ground, Steel, Flying
-Muk, Muk-Alola: -Fire Punch, +Drain Punch


-Enamorus-Therian: add setup set with Tera Ground, Agility/Moonblast/Earth Power/Mystical Fire/Superpower, Weakness Policy *
-Choice Band Iron Leaves: -Wild Charge (will now always get Psyblade)
-Enforce Psychic STAB on all Psychic/Fighting types (Medicham), remove hardcode previously for Gallade
-Stonjourner: +Tera Steel
-AV Eelektross: -Tera Electric, +Acid Spray, +Tera Poison
-Mismagius: change role to Wallbreaker (removing Choice Scarf)
-Rotom-Wash, Zapdos: -Discharge, +Thunderbolt


-Scyther set 1: -U-turn, role changed to Setup Sweeper (will always have Swords Dance)
-add Scyther set 2: Fast Support with Aerial Ace, Close Combat, Defog, U-turn, Tera Fighting †
-Corviknight: change role to Bulky Support (Body Press will no longer always appear), -Tera Fighting, -Bulk Up, +U-turn †
-Bulky Attacker Great Tusk: -Tera Dark, +Tera Steel (Knock Off will appear less often) *†
-Physical Samurott will now always get Swords Dance *
-Split Grumpig sets *
set 1: Bulky Setup, -Trick, -Focus Blast, -Tera Fighting
set 2: pure choice with -Nasty Plot, -Dazzling Gleam, -Tera Fairy
-Grafaiai: -Switcheroo, rename role to AV Pivot (Choice Band no longer exists) *

-Slowking: remove set 3 (Future Sight + Chilly Reception), because statistical analysis showed that adding it made it worse.
-Oinkolognes (both): remove Double-Edge, because statistical analysis showed that adding it made it worse.

 

[A Cake Wearing A Hat]

6/11:

Changes meant to reduce the frequency of choice items are marked with a *

-Giratina-Origin will no longer have forced Shadow Sneak, but will now have forced Shadow Ball.
-Kleavor will now always have X-Scissor.
-Agility Sheer Force Hisuian Braviary's set was renamed to "Setup Sweeper" to better reflect its role.
-Landorus-T's support set was changed to a "Bulky Support" role, which removes Life Orb from it and gives it only Leftovers.
-Ting-Lu: Set 2 was changed to an "AV Pivot" role, removing Choice Band. *
-Iron Hands: Set 1 was changed to an "AV Pivot role, removing Choice Band. *
-Iron Hands is also gaining a second set: Bulky Attacker with Swords Dance. It will get Leftovers.
-Chansey is being added. It will have Blissey's old set with Heal Bell added.
-Rayquaza set split: *
--Setup Sweeper, with Tera Flying Dragon Ascent / Outrage / Earthquake / DD. Gets Boots.
--Fast Attacker, with Tera Normal SD / ESpeed / Dragon Ascent / Earthquake / U-turn. Can get Boots or Choice Band.
Hisuian Samurott: -X-Scissor, +Sacred Sword
Falinks: -Poison Jab, +Iron Head, +Tera Steel on the non-Tera Blast set
Both Indeedees: +Tera Fairy
Gengar's Nasty Plot set: +Tera Fighting
Life Orb 4 Attacks Lokix: +Tera Fighting

 

[A Cake Wearing A Hat]

6/19:

Gen 9 Random Battle:
-Oranguru: -Trick Room, +Nasty Plot
-Luvdisc: +Icy Wind; Luvdisc will only roll one of Icy Wind/Charm/Ice Beam at a time.
-Fast Support Garchomp: -Draco Meteor, +Outrage; Outrage will get a Rocky Helmet in this situation.
-Setup Sweeper Charizard: -Thunder Punch, -Tera Fire, +Outrage, +Tera Dragon
-Swords Dance Iron Hands: +Thunder Punch
-Calyrex-Shadow: +Tera Dark
-Blissey: -Shadow Ball, +Stealth Rock (it was worth a shot)
-Blissey and Chansey will now always have Thunder Wave.
-Basculins will now always have Aqua Jet.
-Tera Blast Inteleon and Floatzel were removed.
-Floatzel still has a Bulk Up set, which now runs Wave Crash, Low Kick, and Crunch over Liquidation and Tera Blast, with Leftovers and Tera Water/Steel/Fighting/Dark.
-Espeon has gained a Tera Blast set: Calm Mind, Psyshock, Tera Blast, and Dazzling Gleam/Morning Sun with Tera Fire/Fighting.
-Electrode has gained a Tera Blast set (because it is stronger than Regieleki): Taunt, Thunderbolt, Volt Switch, and Tera Blast Ice.

Gen 9 Random Doubles:
-Electroweb can no longer be generated as a primary Electric STAB move.
-Wugtrio gets a Choice Band now, instead of a Choice Scarf.
-Altaria now runs Cloud Nine.
-Sneasler and Toxicroak now run Clear Amulet if they have Fake Out.
-First Impression now prevents Booster Energy
-Shell Smash users now have White Herb.
-Oricorio-Pa'u will now always have Revelation Dance
-Magnezone, Heatran, and Tinkaton will now always have Steel-type moves.
-Cinderace now gets Life Orb with U-turn.
-Moltres: -Hurricane
-Coalossal: +Heat Wave
-Sunflora: +Dazzling Gleam
-Cresselia, Scream Tail, Ursaluna, and Toxapex had their levels lowered manually.
-Tera Types have been adjusted for a very, very large number of Pokemon. More defensive Tera Types were added, some STAB Tera Types were removed, and Tera Types as a whole were looked over and overhauled to be more optimal. See the Pull Request for details.

 

[A Cake Wearing A Hat]

Late, but still important to have this here:

6/23:

Changes intended to increase the frequency of hazard removal are marked with *.

Gen 9 Random Battle:
-Dugtrio's role is now Fast Support; non-Choice Band variants can now be Focus Sash in the lead slot.
-Houndoom will no longer get Nasty Plot + Sucker Punch.
-Scream Tail and Klefki: +Dazzling Gleam; Dazzling Gleam and Play Rough will not generate together.
-Bulky Support Whiscash: -Tera Ground, +Tera Poison
-Bulky Attacker Donphan: -Tera Poison, -Gunk Shot *
-Calyrex: +Psychic, because statistical analysis showed removing Psychic to be deeply bad for its effectiveness.
-Hawlucha: +Encore

-Dark-types will generate Black Glasses if they have ALL of the following on the set:
--Sucker Punch
--Another Dark move
--Setup
--A role that would otherwise give it Life Orb under these conditions
(Functionally, this affects Urshifu, Grimmsnarl, Samurott-Hisui, and Chien-Pao if the team has hazard removal)

-Pokemon with the Bulky Support role will now always get Defog or Rapid Spin if possible, unless the team already has hazard removal. * As a result:
--Cryogonal now no longer always has Flash Cannon and can sometimes get Haze + Rapid Spin.
--Drifblim Set 1 is now Bulky Support, to be included in this new rule *
--Avalugg is now Bulky Support, to be included in this new rule (and Curse will now only exist with removal on the team) *
--Iron Treads is now Bulky Support, to be included in this new rule *
--Toedscruel is now Bulky Attacker, to be discluded from this new rule
--Giratina-Origin is now Fast Attacker, to be discluded from this new rule
--Talonflame is now Bulky Attacker, to be discluded from this new rule

Gen 9 Random Doubles:
-Ceruledge now always has Swords Dance and does not always have Protect.
-Clawitzer has gained a Doubles Bulky Attacker set of Dark Pulse, Aura Sphere, Heal Pulse, Muddy Water, and Protect, with a Sitrus Berry.
-Gholdengo's role was changed to Doubles Bulky Setup, which gives it a Sitrus Berry.
-Prankster users (Tornadus and Murkrow) will now always have Tailwind.
-Scream Tail now has Dazzling Gleam; Dazzling Gleam will not generate with either Howl or Play Rough.
-Battle Bond now actually works on Greninja.
-Persian with Covet will now get a Normal Gem. Please use Fake Out first, it doesn't steal items if you normal gem the Covet.
-Dragon Dance Iron Thorns no longer has Stone Edge.

7/1:
Level balancing occurred. Random Doubles will now track winrate statistics in /rwr from 1300+ elo instead of 1400+.

 

[A Cake Wearing A Hat]

7/15:

Gen 9 Random Battle:
-Bulky Support Garganacl: -Stone Edge, +Iron Defense (in other words, Iron Defense Salt Cure now exists. Iron Defense will never generate alongside Stealth Rock. Curse Stone Edge will still exist. Council decision.)
-Klefki now has a set split. One set has Play Rough and Magnet Rise, while the other has Dazzling Gleam and Foul Play. This fixes the rare bug of getting two fairy moves on Klefki. The Foul Play set will also have Tera Flying as an option. A hotfix shortly after this update prevented Klefki from getting Focus Sash, which this update would've accidentally allowed.
-Azumarill's sets were fused into one; the only functional difference is that now Belly Drum exists 33% of the time instead of 50%.
-Talonflame will now get Gale Wings 33% of the time instead of 66% of the time (its ability rating was lowered).
-Barraskewda: -Liquidation, +Waterfall
-Setup Sweeper Garchomp: -Fire Fang, +Poison Jab
-Articuno and Articuno-Galar: -Air Slash
-Dondozo: -Tera Ground
-Dudunsparce-Threesegment will no longer get Roost 3 attacks.

Gen 9 Random Doubles Battle:
-Electrode now has a Tera Blast user set, with Tera Blast Ice, Thunderbolt, Volt Switch, and Protect. This is because it's objectively better at using Tera Blast than Regieleki, and we have that, so why not.
-Sitrus Berry Delibird should now activate its Sitrus Berry on switching into Stealth Rock.
-Sitrus Berry users will activate their berries in time with Stealth Rock switch-ins in general now, and Regenerator Pokemon will not have their HP lowered to reduce Stealth Rock damage.
-Talonflame will now always have Gale Wings in Doubles.
-Mabosstiff: Role changed to Doubles Wallbreaker; as a result, it no longer gets Choice Scarf.
-Tera Blast Hisuian Zoroark: -Shadow Ball, +Bitter Malice
-Chesnaught: +Tera Fire, +Tera Water (both sets)
-Floatzel: -Tera Fire, -Tera Steel (now only Water)
-non-Tera Blast Meloetta: -Tera Dark, +Tera Fighting

 

[A Cake Wearing A Hat]

8/1:

Level balancing occurred.

Gen 9 Random Doubles:

This update contains the first Gen 9 Random Doubles level balancing patch.

This update also contains the following changes:
-Hisuian Qwilfish is being added at level 86. It will have Crunch, Gunk Shot, Icy Wind, and Toxic Spikes, with Tera Flying. (council decision)
-Spiritomb has gained a set split:
--The pre-existing set but minus Trick Room and Snarl
--Doubles Bulky Attacker, with Foul Play, Trick Room, Snarl, and Will-O-Wisp.

-Altaria has gained a set split:
--The pre-existing set but minus Protect
--Bulky Protect, with Brave Bird, Roost, Protect, and Will-O-Wisp.

-Choice Scarf Gothitelle (and therefore Hypnosis Gothitelle) are being removed entirely in an attempt to salvage its extremely low win rate.

-Talonflame will now always have Tailwind.
-Pokemon will now never have more than one entry hazard at once if given the option.

-Friend Guard Maushold: -Super Fang, +Population Bomb (it also now gets Wide Lens)
-Muk: +Drain Punch
-Coalossal: +Rapid Spin
-Spidops: -Taunt, +Bug Bite (it will always have Bug Bite)
-Clodsire: +Stealth Rock, -Toxic
-Espathra: +Baton Pass
-Great Tusk: +Protect, +Rock Slide, -Stone Edge (it can now get Sitrus Berry)
-Forretress: -Iron Head, -Helping Hand, +Bug Bite, +Volt Switch
-Cyclizar Set 2: -Tera Dark, +Tera Fire
-Choice Scarf Staraptor: +Tera Normal
-Pikachu and Raichu Set 1: -Tera Water, +Tera Grass
-Delphox is now only Tera Fire.

 

[A Cake Wearing A Hat]

8/2:

Gen 9 Random Battle:

-Espeon's Tera Blast user set was removed due to it underperforming in winrates.
-Cryogonal is gaining a Tera Blast user set. It will be Heavy-Duty Boots with Rapid Spin, Tera Blast Electric, Ice Beam, and Recover.

-Houndoom can get Sucker Punch + Nasty Plot again because the set's removal caused Houndoom's winrate to drop.

-Chesnaught: -Spiky Shield
-Wo-chien: -Energy Ball, +Giga Drain
-Scovillain: -Giga Drain, +Energy Ball
-Sudowoodo: -Spikes
-Cryogonal set 1: +Tera Poison
-Curse Garganacl: +Earthquake, -Tera Fighting
-Protect and Support Garganacl: +Tera Dragon

 

[A Cake Wearing A Hat]

8/10:

Gen 7 Random Battles has been revamped from scratch to use the Gen 9 set generation system. This means that Pokemon can now have split sets and have their items and moves generated based on their assigned role(s). Please read the Rands Explainer Thread for information on what exactly this entails, and this post to see what is functionally different between Gen 7 and Gen 9.

 

[A Cake Wearing A Hat]

8/14:


Changes marked with an * help reduce the frequency of choice items.


Gen 9 Random Battle:
-Battle Bond Greninja has been added with Dark Pulse/Gunk Shot/Hydro Pump/Ice Beam, Tera Poison/Water. It is Fast Attacker and gets Life Orb. Protean will still exist unchanged. Council decision. *
-Overgrow Meowscarada has been added as a second set: Fast Attacker, Flower Trick/Hone Claws/Knock Off/Play Rough/Toxic Spikes, Tera Grass/Dark/Fairy. It gets Life Orb. Protean will still exist unchanged. Council decision. *


-Sandy Shocks: remove Tera Blast user set, due to its significant winrate drop
-Meloetta: add Tera Blast user set, with Close Combat, Relic Song, Psychic, and Tera Normal. It gets Life Orb. It's the same set that it runs in doubles. *
-Magnezone: role change to Bulky Support, to lower Scarf to 50% *
-Decidueye-Hisui: +Knock Off
-Bulky Attacker Magearna: -Tera Steel
-Bulky Setup Floatzel: +Tera Ice
-Articuno: -Hurricane, +Brave Bird
-Bulky Setup Iron Thorns: +Tera Grass
-Bulky Support Swalot: +Clear Smog
-Coalossal: +Tera Ghost, +Tera Grass
-Setup Sweeper Whiscash: +Tera Steel, -Tera Water
-Setup Typhlosion-Hisui: -Flamethrower, +Fire Blast


Gen 9 Random Doubles Battle:
-Doubles Support Maushold-Four: -Super Fang, +Population Bomb. This fixes an oversight in the last doubles update, when we changed Maushold's set but not this forme.
-Cinderace (Offensive Protect) will now get Blaze as its ability, instead of Libero.
-Offensive Protect Klawf: -Substitute

General:

Pokemon with 4 or more formes will now appear significantly more often than they did before. Arceus, especially. This also affects past gens.