current version: 3.7.5

to use the rlmod file, download RanseiLink, and use it to import rlmod. rlmod allows you to make further edits in RanseiLink if you desire.
to use the xdelta file, download xdelta utility and patch a clean ROM. works fine, but no customizability.
links are at the bottom of the page.

folder also includes .dsv file, which is my (absurdly cracked) personal save file you can use if you want to mess about in postgame without going through tutorials and stuff. rename it to whatever your patched .nds file is named, keeping the .dsv part obviously

the earliest you can tell that the patch was successful is after the tutorial battle against tepig and bidoof. on the overworld, select your kingdom and hit "info". go to your character and hit Y on the page where it displays your warrior stats. you know it worked if Top Speed's description says that it lasts for 2 turns, and if Oichi's Sweet Song says that it heals 50 HP.

WARRIOR SKILLS
Bustle: duration increased to 2 turns
Eagle Eye: increased accuracy -> guaranteed hit (AI will use it)
Crack Shot: affects adjacent allies
Deep Breath: cures status, duration reduced to 1 turn
Fortify: also blocks crits (AI will use it preemptively)
Brotherhood: also heals 20 HP
Greed -> Desensitize: cures status, blocks status for 3 turns
High Jump -> Flash Step: dodges all attacks, climb to high places for 1 turn
Marksman: duration reduced to 2 turns, increased accuracy -> guaranteed hit (AI will use it)
Rally: duration reduced to 2 turns
Top Speed: duration increased to 2 turns

Furin Kazan: affects adjacent allies instead of all allies
Inspiration: affects adjacent allies instead of all allies
Belief: also restores HP over time, duration increased to 4 turns
Bewilder: also increases Speed
Cold Eyes: also increases status chance
Compassion: affects all allies
Cunning: also increases crit chance
Extinguish: changed to grant flinch chance to all allies for 1 turn
Father Figure: also increases Defense
Grace: changed to fully heal and cure status of all allies, but prevent movement for 2 turns
Grand Dream: changed to increase Attack and Energy for 3 turns
Great Uniter: changed to increase Attack and Energy and block status for 3 turns
Kabuki Dance: changed to increase Attack and restore 50 HP to all allies
Lazybones: also increases status chance
Love & Honor: only raises Attack by 1, but lasts 3 turns
Mayhem: also gives a 60% chance to confuse, no longer climbs to high places
Nene Ninpo: also increases status chance and crit chance
Rebellion: also increases accuracy, duration increased to 3 turns
Resolution: also increases accuracy and blocks crits
Sacrifice: changed to raise Attack by 3 and add 100% flinch chance, no longer increases Range
Strategist: also blocks status
Trickster: changed to dodge all attacks, increase Range by 2, increase crit chance for 1 turn
Typhoon: increases crit chance, no longer raises Attack
Viper's Bite: also increases accuracy
Warrior Woman: also increases Range

MOVES
Absorb: replaced with Mega Drain (26 power, 100 acc, tile in front, drains 50%)
Fire Blast: replaced with Blast Burn (58 power, 90 acc, two rows, can't be used consecutively)
Hyper Fang: replaced with Bullet Seed (14 power, 100 acc, ahead 2 tiles, hits 2-5 times)
Hyper Voice: replaced with Uproar (44 power, 100 acc, ring adjacent, hits 2-3 times, wakes sleeping targets)
Gyro Ball: replaced with Flare Blitz (55 power, 100 acc, chevron, lowers user defense and range)
Slash: replaced with Fake Out (28 power, 100 acc, tile in front, 100% flinch)
Mega Drain: replaced with Giga Drain (41 power, 100 acc, tile in front, drains 50%)
Tackle: replaced with Aerial Ace (36 power, never misses, tile in front)
Twineedle: replaced with Pin Missile (12 power, 95 acc, column 2 tiles, hits 2-5 times)
Venoshock: replaced with Earthquake (45 power, 100 acc, ring adjacent)
Bullet Punch: replaced with Waterfall (41 power, 100 acc, ahead 2 tiles + move user, 20% flinch)
Dream Eater: replaced with Drain Punch (41 power, 100 acc, tile in front, drains 50%) [known limitation: cannot hit breakable objects]
Hi Jump Kick: replaced with Echoed Voice (26 power, 100 acc, tile in front, double power each use)
Low Kick: replaced with Rock Smash (26 power, 100 acc, tile in front, 50% defense down)
Sky Drop: move cannot be replaced due to hard coded behavior (unused)

Assurance: 31 -> 36 power
Body Slam: range changed to chevron
Bolt Strike: range changed to row
Brave Bird: 58 -> 55 power
Brine: 35 -> 38 power
Dragon Rush: 75 -> 85 acc
Faint Attack: name changed to Feint Attack
Fire Spin: hits 2-5 times
Future Sight: 45 -> 51 power, range changed to plus
Hex: 31 -> 38 power
Hypnosis: 60 -> 70 acc
Leaf Storm: 52 -> 55 power
Low Kick: 90 -> 100 acc
Meteor Mash: 85 -> 90 acc
Mud Bomb: 85 -> 95 acc, range changed to column 2 tiles 2 ahead
Poison Fang: 30% -> 50% toxic chance
Poison Tail: 29 -> 31 power
Psybeam: 35 -> 38 power
Psyshock: range changed to row 2 ahead
Razor Leaf: 31 -> 34 power
Rock Tomb: 31 -> 36 power, 80 -> 95 acc
Rock Wrecker: 90 -> 100 acc, range changed to column 2 tiles 2 ahead
Sacred Sword: range changed to left and right tile
Stone Edge: range changed to reverse T shape
Thunder: range changed to row 3 ahead
Vine Whip: 24 -> 27 power
Volt Switch: range changed to column 2 tiles
Volt Tackle: 58 -> 55 power
Water Pulse: 36 -> 38 power

ABILITIES

Hero: increases Attack and Defense by 2 stages instead of 1
Confidence: also increases accuracy. the effect will not be displayed, but it works.
Shackle: also decreases Defense. the effect will not be displayed, but it works.

POKEMON
Vaporeon: uses Water Pulse
Jolteon: lost Vanguard, gained Sequence
Flareon: lost Flame Boost, gained Run Up
Espeon: evolve at 50% link
Umbreon: lost Dodge, gained Black Hole, evolve at 50% link, uses Foul Play
Leafeon: evolve at 73 Defense with Emerald Grace
Glaceon: lost Stealth, gained Clear Body, evolve at 71 attack with Ivory Grace
Gyarados: lost Tenacity, gained Moxie
Pikachu: 75 -> 95 Defense, evolve at 30% link
Raichu: 205 -> 225 Speed, lost Instinct, gained Run Up
Wooper: 55 -> 95 Attack, lost Deep Sleep, gained Unaware
Quagsire: lost Deep Sleep, gained Unaware
Jigglypuff: evolve at 30% link
Wigglytuff: 145 -> 175 Attack, uses Uproar
Golbat: 135 -> 165 Attack
Crobat: lost Sponge, gained Interference, evolve at 60% link
Staraptor: 125 -> 135 Defense, lost Vanguard, gained Sniper
Bibarel: lost Deep Sleep, gained Power Nap, uses Waterfall
Whirlipede: 2 -> 3 Range, lost Hero, gained Run Up
Scolipede: 3 -> 4 Range, 185 -> 205 Attack, uses Poison Jab
Luxray: 195 -> 245 Attack
Litwick: lost Warm Blanket, gained Flame Boost
Lampent: lost Warm Blanket, gained Flame Boost
Chandelure: lost Warm Blanket, gained Flame Boost
Boldore: 2 -> 3 Range, lost Explode, gained High-Rise, uses Rock Tomb
Gigalith: 2 -> 3 Range, 205 -> 215 Defense, lost Explode, gained High-Rise, uses Rock Slide
Flaaffy: uses Electro Ball
Ampharos: 169 -> 180 Defense, uses Discharge
Cottonee: uses Mega Drain
Whimsicott: lost Melee, gained Shackle
Lucario: 3 -> 4 Range, lost Sprint, gained Justified
Chimecho: 240 -> 260 HP, 155 -> 175 Defense
Arbok: 175 -> 195 Attack, uses Poison Fang
Forretress: uses Pin Missile
Persian: 3 -> 4 range, uses Fake Out
Walrein: 2 -> 3 Range
Gothitelle: lost Calming, gained Black Hole
Krokorok: lost Disgust, gained Celebrate
Krookodile: 145 -> 155 Defense, lost Disgust, gained Celebrate
Dusknoir: 2 -> 3 Range, uses Hex
Munna: lost Deep Sleep + Instinct, gained Life Force + Calming
Musharna: lost Calming, gained Life Force + Share, uses Psybeam
Zebstrika: 3 -> 4 Range, 165 -> 205 Attack
Dragonite: 2 -> 3 Range
Tyranitar: 2 -> 3 Range
Metang: uses Metal Claw
Metagross: lost Thrust, gained Conqueror
Garchomp: uses Earthquake
Croagunk: lost Disgust, gained Water Absorb
Toxicroak: 177 -> 217 Attack, lost Melee, gained Water Absorb
Zweilous: evolve at 60 Attack
Hydreigon: evolve at 134 Attack
Froslass: 3 -> 4 Range, lost Mountaineer, gained Interference
Timburr: uses Rock Smash
Beartic: 2 -> 3 Range, 225 -> 265 Attack
Charizard: 2 -> 3 Range
Gengar: lost Levitate, gained Frighten + Dodge + Shadow Dash
Snivy: lost Grass Cloak, gained Nurse
Servine: lost Grass Cloak, gained Nurse
Serperior: 3 -> 4 Range, lost Grass Cloak, gained Medic, uses Giga Drain
Emboar: 2 -> 3 Range, uses Blast Burn
Swadloon: 2 -> 3 Range
Leavanny: 145 -> 211 Attack, 155 -> 165 Defense, evolve at 50% link
Alakazam: 135 -> 145 Defense
Treecko: uses Mega Drain
Grovyle: 3 -> 4 Range
Sceptile: 3 -> 4 Range, lost Mountaineer, gained Climber
Simisage: lost Melee + Hero, gained Nurse + Celebrate, uses Bullet Seed
Pansear: uses Incinerate
Simisear: lost Melee, gained Celebrate, uses Flame Burst
Panpour: lost Dodge, gained Celebrate
Simipour: lost Melee, gained Celebrate
Darmanitan: uses Flare Blitz
Haxorus: lost Pride, gained Parry
Galvantula: uses Thunder
Aggron: 2 -> 3 Range
Drilbur: lost Stealth, gained Mold Breaker
Excadrill: lost Stealth + Run Up, gained Mold Breaker + Parry
Drapion: uses Night Slash
Pawniard: uses Metal Claw
Bisharp: uses Assurance
Rhydon: 2 -> 3 Range, lost Jagged Edge, gained Run Up
Rhyperior: 2 -> 3 Range
Shieldon: lost Last Bastion, gained Thrust
Bastiodon: 2 -> 3 Range, lost Last Bastion/Sturdy, gained Shackle/Confidence
Scrafty: uses Drain Punch
Drifloon: lost Decoy, gained Celebrate
Drifblim: 3 -> 4 Range, 165 -> 185 Attack, lost Decoy, gained Celebrate
Braviary: 4 -> 3 Range, lost Keen Eye, gained Celebrate, uses Aerial Ace
Armaldo: 2 -> 3 Range
Onix: 2 -> 3 Range
Steelix: 2 -> 3 Range, uses Bulldoze
Beedrill: 165 -> 185 Attack, lost Mountaineer, gained Sniper, uses Pin Missile
Munchlax: uses Headbutt
Snorlax: 2 -> 3 Range, lost Deep Sleep, gained Power Nap
Weavile: evolve at 165 Speed
Audino: uses Echoed Voice
Carnivine: uses Giga Drain, no longer appears as wild Pokemon in main story
Spiritomb: uses Feint Attack
Scizor: lost Pride, gained Melee
Lapras: lost Wave Rider, gained Healer
Articuno: 3 -> 4 Range
Registeel: 2 -> 3 Range
Groudon: 2 -> 3 Range

SWARM POKEMON

Swarm Pokemon can be encountered normally in certain episodes.

Ninja: Croagunk (Viperia), Drifloon (Avia), Sneasel (Nixtorm), Anorith (Cragspur)
Unite Ransei: Beldum (Illusio), Croagunk (Viperia), PanXXXX
Collect 100 Pokemon: Eevee (Aurora), Gible (Terrera), Anorith (Cragspur), Sneasel (Nixtorm)
Junior Warlord: Drifloon (Avia), Croagunk (Viperia), Audino (Aurora), Emolga (Violight)
Not Worth Fighting Over: Audino (Aurora)
Shingen vs Kenshin: Beldum (Illusio), PanXXXX, Emolga (Violight), Drifloon (Avia)
Ransei's Greatest Beauty: Emolga (Violight), Drifloon (Avia)
Defeat Nobunaga: Beldum (Illusio), Croagunk, PanXXXX
Recruit 40 Warriors: Eevee (Aurora), Anorith (Cragspur), Gible (Terrera), Sneasel (Nixtorm)
Two Heroes: all swarm Pokemon are available

Spiritomb and Riolu are available in all postgame episodes.
As a reminder, Lapras is available in Shingen vs Kenshin and Defeat Nobunaga episodes. (unchanged)

WARRIORS

Motochika I: Rally -> Crack Shot
Mitsuhide I: Crack Shot -> Eagle Eye
Nene I: Rally -> Flash Step
Ieyasu I: Brotherhood -> Fortify
Kunoichi I: Convalesce -> Flash Step
Tadakatsu I: Impact -> Adrenaline
Ina I: Crack Shot -> Eagle Eye

Tadakatsu II, Ujizane, Chacha, Tenkai, Munenori, Sasuke, Go: +1 capacity
Hiroko, Bokuzen, Hidenaga, Toshimitsu, Shoun, Chikayasu, Masahide: -1 capacity

NOTABLE CHANGES TO MAX LINKS

pre-evolved forms mostly have the same max link as fully evolved forms, making it easier to assess potential in-game. exceptions are things like rhydon and scyther if max links are significantly different from evolved forms, since they are separately viable pokemon

whenever possible, warriors will have 70% max link with the pokemon they start with. you can beat the game without ever playing the link minigame if you desire

practically every scenario pokemon has been modified, especially postgame

68% links on regular warriors are set to 70%.
on regular warriors, all links below 64% are set to 0; 64-66% links increased to 68%.
on warlords, (almost) all links below 78% are set to 0; 78% links increased to 80%.

the intended effect is to make "search" delegation more useful, and to prevent AI armies from filling their capacities with useless incompatible nonsense.

pure Dragon specialists can achieve higher link with Charizard, Gyarados, Ampharos, Sceptile
pure Ice specialists can achieve higher link with Dragonite, Empoleon
pure Fire specialists can achieve higher link with Drifblim, Steelix
most Fighting specialists can achieve 70% link with Gallade
evolutions should no longer be impossible to obtain due to poor IVs or any other non-obvious reason

improved max links for certain pairings

Nobunaga: Gyarados
Hideyoshi: Gallade, Excadrill
Motochika: Armaldo, Crobat, Toxicroak
Ginchiyo: Lucario, Samurott, Empoleon, Braviary
Motonari: Dusknoir, Spiritomb, Aggron, Gardevoir, Gallade, Forretress
Mitsuhide: Gyarados, Hydreigon, Lucario, Luxray
Yoshihiro: Krookodile, Excadrill
Nene: Charizard, Infernape, Braviary
Kenshin: Crobat, Hydreigon
Ujiyasu: Scizor, Dusknoir
Hanbei: Chandelure, Charizard, Infernape, Alakazam
Kanbei: Glalie, Zebstrika, Beartic
Gracia: Metagross, Gengar, Weavile
Hanzo: Zebstrika, Beedrill
Magoichi: Staraptor, Forretress, Braviary
Kanetsugu: Galvantula, Persian, Metagross
Kai: Conkeldurr, Tyranitar, Krookodile, Aggron
Kiyomasa: Krookodile, Excadrill

OTHER

Bug-types are available as both wild and starting Pokemon in Ninja episodes
Sewaddle replaced with Pineco in Valora's Park
Piplup added to Nixtorm's Snowy Mountain

Fog Machine's name changed to Harmony Cymbal, boosts link gain by 1.2x in addition to its old effect
Guardian Charm's name changed to Everstone Charm, prevents all link gains in addition to its old effect (cry about it)
Lucky Charm boosts link gain by 2x for one battle, replacing its old effect
Dumbell, Strategy Tome, Magic Mirror boost stats by 30 instead of 5
Staff of Purpose / Staff of Courage boost HP by 15%/30% instead of 5%/10%
price of evolution items decreased to 3000 gold
price of Large Sack decreased to 200 gold
evolution item descriptions tell you what pokemon they work on

the professor who shows up on May Year 1 gives practical tips you might not know

increased turn limit of Greenleaf, Terrera, and all wild areas
reduced turn limit of Valora, Pugilis, and Nixtorm

upgrading wild areas improves loot from map-generated treasure boxes
improved treasure from castle maps
added treasure boxes to some castle maps that didn't have them

put grass tiles under Avia jump ramps so AI-controlled Grass types will use the ramps
added/moved jump ramp(s) in sky garden 2/3, avia. tweaked destination tiles
added more floating cubes to floating rock 2/3 and valora
added rope bridges to sky garden 2 and illusio
valora crane will move pokemon to the center of the map instead of randomly
pokemon in yaksha treasure room can choose which corner of the map to return to
removed dead trees from yaksha (reward pool was shared with treasure boxes)
added teleports within map to ravine 2, cave 3
moved an inconvenient trap in farm 3
added hot spring to Spectra, removed a few statues
secret passage in viperia spits you out closer to the banner
electric system in violight is more likely to hit squares where people are fighting
added more lifts to terrera, added grass teleports, banners must be held for 5 turns
replaced some water tiles in nixtorm with thin ice, shortened drifting ice path
thin ice launches you in a predetermined direction upon breaking, hopefully closer to the action
repurposed strange flower as a jump ramp that launches you in a preset direction
added strange flower to ravine 3

starting positions in illusio and valora are evenly split between both sides of the map
changed pokemon starting positions in several maps

USEFUL LINKS

https://github.com/Deijin27/RanseiLink
ROM editing program that uses rlmod files. allows customized edits, for example if you wanted to give Gengar Levitate

https://www.romhacking.net/utilities/598/
ROM patcher if you prefer to patch your .nds file the old fashioned way

https://github.com/MathyFurret/conquestsavefiletools
use between episodes to modify your Pokemon's IVs. input .dsv file from emulator battery folder, then rename the resulting file back to original file name and drop it back into your battery folder, replacing the old one

https://github.com/Deijin27/conquest-memory-editing/blob/master/normalizeExp.lua
lua script that can be used in-game to set the link of all a warrior's pokemon to the one with the highest link (essentially acts like exp share when used after every battle). press Y, find your warrior, and run the script while they are highlighted

https://gamefaqs.gamespot.com/ds/654723-pokemon-conquest/faqs/78088
the only ultra-comprehensive vanilla guide in the English-speaking Conquest community that I know of, written by me

https://veekun.com/dex/conquest
accurate vanilla info source