Observed target KO or switch rate is upstream p: the fraction of relevant encounters where the target was knocked out or switched out. Standard error is upstream d. The conservative score is p − 4d. These ladder observations do not prove a set-specific counter.
How to read this table
Use encounter count and standard error to judge the sample. Damage estimates below use inferred sets and remain separate from the observed ladder metric.
#
Checker
Encounters
Conservative score
Target KO or switch rate
01
Heatran
FireSteel
OFFENSIVE CHECK
View matchup
47.032
89.3%
Standard error 6.37 points
▾
252+ SpA Heatran Magma Storm vs. 252 HP / 252+ SpD Jirachi: 258-306 (63.8 - 75.7%) -- guaranteed 2HKO after Leftovers recovery and trapping damage
02
Ferrothorn
GrassSteel
DEFENSIVE CHECK
View matchup
24.195
77.9%
Standard error 8.44 points
▾
252+ Atk Jirachi Fire Punch vs. 252 HP / 252+ Def Ferrothorn: 180-216 (51.1 - 61.3%) -- 92.6% chance to 2HKO after Leftovers recovery
03
Greninja
WaterDark
OFFENSIVE CHECK
View matchup
77.072
65.4%
Standard error 7.39 points
▾
252+ SpA Choice Specs Greninja Dark Pulse vs. 252 HP / 252+ SpD Jirachi: 264-312 (65.3 - 77.2%) -- guaranteed 2HKO after Leftovers recovery
04
Landorus-Therian
GroundFlying
OFFENSIVE CHECK
View matchup
119.281
61.7%
Standard error 7.59 points
▾
252+ Atk Landorus-Therian Earthquake vs. 252 HP / 0 Def Jirachi: 390-458 (96.5 - 113.3%) -- 75% chance to OHKO
05
Toxapex
PoisonWater
DEFENSIVE CHECK
View matchup
30.638
58.3%
Standard error 8.91 points
▾
252+ Atk Jirachi Iron Head vs. 252 HP / 252+ Def Toxapex: 32-38 (10.5 - 12.5%)
06
Medicham-Mega
FightingPsychic
OFFENSIVE CHECK
View matchup
20.591
59.8%
Standard error 10.81 points
▾
252+ Atk Pure Power Medicham-Mega High Jump Kick vs. 252 HP / 0 Def Jirachi: 388-457 (96 - 113.1%) -- 75% chance to OHKO
07
Kartana
GrassSteel
OFFENSIVE CHECK
View matchup
22.884
55.5%
Standard error 10.39 points
▾
252+ Atk Kartana Knock Off (97.5 BP) vs. 252 HP / 0 Def Jirachi: 300-354 (74.2 - 87.6%) -- guaranteed 2HKO
08
Latias-Mega
DragonPsychic
SOFT CHECK
View matchup
44.341
43.7%
Standard error 10.40 points
▾
252+ SpA Latias-Mega Thunder vs. 252 HP / 252+ SpD Jirachi: 101-119 (25 - 29.4%) -- guaranteed 5HKO after Leftovers recovery
09
Tornadus-Therian
Flying
SOFT CHECK
View matchup
20.692
42.6%
Standard error 10.87 points
▾
252+ SpA Tornadus-Therian Heat Wave vs. 252 HP / 252+ SpD Jirachi: 146-174 (36.1 - 43%) -- 97% chance to 3HKO after Leftovers recovery
10
Tapu Koko
ElectricFairy
SOFT CHECK
View matchup
60.037
30.3%
Standard error 8.26 points
▾
252+ SpA Life Orb Tapu Koko Thunderbolt vs. 252 HP / 252+ SpD Jirachi in Electric Terrain: 183-216 (45.2 - 53.4%) -- 0.4% chance to 2HKO after Leftovers recovery
11
Magearna
SteelFairy
SOFT CHECK
View matchup
109.477
18.2%
Standard error 6.32 points
▾
252+ SpA Magearna Hidden Power Fire vs. 252 HP / 252+ SpD Jirachi: 104-124 (25.7 - 30.6%) -- 2% chance to 4HKO after Leftovers recovery
12
Clefable
Fairy
SOFT CHECK
View matchup
42.97
26.1%
Standard error 9.46 points
▾
0- Atk Clefable Knock Off (97.5 BP) vs. 252 HP / 0 Def Jirachi: 94-112 (23.2 - 27.7%) -- 75.4% chance to 4HKO
13
Tapu Bulu
GrassFairy
SOFT CHECK
View matchup
24.112
8.7%
Standard error 5.72 points
▾
252+ Atk Tapu Bulu Wood Hammer vs. 252 HP / 0 Def Jirachi in Grassy Terrain: 161-190 (39.8 - 47%) -- 93% chance to 3HKO after Leftovers recovery and Grassy Terrain recovery
14
Diancie-Mega
RockFairy
SOFT CHECK
View matchup
23.943
9.0%
Standard error 5.85 points
▾
252+ SpA Diancie-Mega Earth Power vs. 252 HP / 252+ SpD Jirachi: 182-216 (45 - 53.4%) -- 0.4% chance to 2HKO after Leftovers recovery
15
Tapu Fini
WaterFairy
SOFT CHECK
View matchup
21.685
16.4%
Standard error 7.95 points
▾
Tapu Fini Nature's Madness vs. 252 HP Jirachi: 202-202 (50 - 50%) -- guaranteed 3HKO after Leftovers recovery
Ranked #40 with 4.82% usage. Sorted by conservative score.