Breeding for passive skills
Only 23 passive skills are ever born onto a Pal, across 46 species. Those are the parents worth starting from — everything else has to be rolled, and the game files do not state the odds for that.
How it actually works
The species a child hatches as is decided entirely by breed rank — the calculator works that out exactly, because the game states it. Passives are a separate roll layered on top, and they are the reason people breed the same pair hundreds of times.
A passive neither parent carries can still appear, because some of the roll is random. One that both parents carry is more likely to pass down. Beyond those two statements, Palworld’s data tables contain no inheritance probabilities at all — no per-trait chance, no count of how many carry, no reroll odds. Any site giving you a percentage has taken it from community testing, which may well be right, but is not something this site can read out of the game and so will not print as fact.
The practical consequence is simple and does not need odds: start from parents that already have the trait. Breeding a Pal with itself returns the same species every time, so it is how you keep rolling passives without losing what you have.
Pals born with a passive
Roll weight is the game’s own lottery weighting for when a random trait is drawn — higher appears more often. It is a relative weight, not a percentage, and the files carry no table converting it into one.
HeavyweightDefense +20% Immune to Knockback
roll weight 100
Kingpaca#021Neutral
Neutral
Kingpaca Cryst#021BIce
Ice
Mammorest#087GrassGround
Grass
Ground
Mammorest Cryst#087BIceGround
Broncherry#108Grass
Broncherry Aqua#108BGrassWater
Water
Braloha#110GrassGround
Reptyro#129FireGround
Fire
Reptyro Cryst#129BIceGround
Pierdon#131Ground
Pierdon Cryst#131BIce
Wumpo#134Ice
Wumpo Botan#134BGrass
Dualith#138GroundGrass
Dualith Noct#138BGroundDark
Dark
Knocklem#159Ground
Knocklem Ignis#159BFire
Silvegis#160Dragon
Dragon
Aegidron#184DragonGroundLegendAttack +20% Defense +20% Movement Speed increases 20%
roll weight 100
Paladius
Necromus
Frostallion
Frostallion Noct
Neptilius
JetragonHard Skin
roll weight 100
Digtoise
Warsect
Warsect Terra
AstegonOtherworldly CellsAttack +10% Fire damage reduction 15% Lightning damage reduction 15%
roll weight 100
Xenovader
Xenogard
XenolordHooligan
roll weight 100
Gorirat
Gorirat TerraLord of the Underworld30% increase in Dark attack damage.
roll weight 100Abnormal10% decrease in incoming Neutral damage.
roll weight 100
LovanderCelestial Emperor30% increase in Neutral attack damage.
roll weight 100Coward
roll weight 100
CattivaDivine Dragon30% increase in Dragon attack damage.
roll weight 100Earth Emperor30% increase in Earth attack damage.
roll weight 100
AnubisEternal Flame30% increase to Fire attack damage. 30% increase to Lightning attack damage.
roll weight 100
Blazamut RyuFlame Emperor30% increase in Fire attack damage.
roll weight 100
BlazamutGluttonHunger decreases +10.0% faster.
roll weight 100
RelaxaurusIce Emperor30% increase in Ice attack damage.
roll weight 100Invader30% increase in Dark attack damage. 30% increase in Dragon attack damage.
roll weight 100Lord of Lightning30% increase in Lightning attack damage.
roll weight 100
Orserk
ElectricLord of the Sea30% increase in Water attack damage.
roll weight 100
JormuntideLunker20% increase to Water attack damage 20% increase to Ice attack damage 20% increase to defense.
roll weight 100Sadist
roll weight 100
SplatterinaSavior30% increase in Neutral attack damage. 30% increase in Grass attack damage.
roll weight 100
HartalisSiren of the Void30% increase in Dark attack damage. 30% increase in Ice attack damage.
roll weight 100
Bellanoir LiberoSpirit Emperor30% increase in Grass attack damage.
roll weight 100
LyleenEvery passive skill and its exact effect — including the 398 that no Pal is ever born with.
Extracted from Palworld’s game files on (build 4797106687).