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
Zacian-Crowned
FairySteel
OFFENSIVE CHECK
View matchup
289.269
86.1%
Standard error 2.03 points
▾
+1 252+ Atk Zacian-Crowned Iron Head vs. 252 HP / 0 Def Arceus-Fairy: 408-482 (91.8 - 108.5%) -- 56.3% chance to OHKO
02
Necrozma-Dusk-Mane
PsychicSteel
OFFENSIVE CHECK
View matchup
207.612
69.3%
Standard error 3.20 points
▾
0- Atk Necrozma-Dusk-Mane Sunsteel Strike vs. 252 HP / 0 Def Arceus-Fairy: 246-290 (55.4 - 65.3%) -- guaranteed 2HKO
03
Eternatus
PoisonDragon
OFFENSIVE CHECK
View matchup
164.869
68.2%
Standard error 3.63 points
▾
252+ SpA Eternatus Sludge Bomb vs. 252 HP / 252+ SpD Arceus-Fairy: 222-264 (50 - 59.4%) -- guaranteed 2HKO
04
Groudon-Primal
GroundFire
OFFENSIVE CHECK
View matchup
430.977
60.0%
Standard error 2.36 points
▾
252+ Atk Groudon-Primal Precipice Blades vs. 252 HP / 0 Def Arceus-Fairy: 237-279 (53.3 - 62.8%) -- guaranteed 2HKO
05
Ho-Oh
FireFlying
DEFENSIVE CHECK
View matchup
422.907
59.9%
Standard error 2.38 points
▾
252+ SpA Pixie Plate Arceus-Fairy Judgment vs. 252 HP / 252+ SpD Ho-Oh: 54-63 (12.9 - 15.1%) -- possible 7HKO
06
Kyogre-Primal
Water
OFFENSIVE CHECK
View matchup
111.411
56.6%
Standard error 4.70 points
▾
252+ SpA Kyogre-Primal Water Spout (150 BP) vs. 252 HP / 252+ SpD Arceus-Fairy in Heavy Rain: 328-387 (73.8 - 87.1%) -- guaranteed 2HKO
07
Arceus
Normal
DEFENSIVE CHECK
View matchup
54.461
62.7%
Standard error 6.55 points
▾
252+ SpA Pixie Plate Arceus-Fairy Judgment vs. 252 HP / 252+ SpD Arceus: 129-153 (29 - 34.4%) -- 3.1% chance to 3HKO
08
Marshadow
FightingGhost
SOFT CHECK
View matchup
173.09
39.5%
Standard error 3.72 points
▾
252+ Atk Marshadow Poltergeist vs. 252 HP / 0 Def Arceus-Fairy: 165-195 (37.1 - 43.9%) -- guaranteed 3HKO
09
Arceus-Ground
Ground
SOFT CHECK
View matchup
93.388
42.5%
Standard error 5.12 points
▾
252+ SpA Earth Plate Arceus-Ground Judgment vs. 252 HP / 252+ SpD Arceus-Fairy: 129-153 (29 - 34.4%) -- 3.1% chance to 3HKO
10
Lunala
PsychicGhost
SOFT CHECK
View matchup
89.851
40.0%
Standard error 5.17 points
▾
+1 252+ SpA Lunala Meteor Beam vs. 252 HP / 252+ SpD Arceus-Fairy: 142-168 (31.9 - 37.8%) -- 93.9% chance to 3HKO
11
Arceus-Fairy
Fairy
SOFT CHECK
View matchup
30.585
50.0%
Standard error 9.04 points
▾
252+ SpA Pixie Plate Arceus-Fairy Judgment vs. 252 HP / 252+ SpD Arceus-Fairy: 129-153 (29 - 34.4%) -- 3.1% chance to 3HKO
12
Zygarde
DragonGround
SOFT CHECK
View matchup
334.257
22.1%
Standard error 2.27 points
▾
252+ Atk Zygarde Thousand Arrows vs. 252 HP / 0 Def Arceus-Fairy: 115-136 (25.9 - 30.6%) -- guaranteed 4HKO
13
Arceus-Dark
Dark
SOFT CHECK
View matchup
147.189
20.1%
Standard error 3.30 points
▾
252+ SpA Arceus-Dark Ice Beam vs. 252 HP / 252+ SpD Arceus-Fairy: 65-77 (14.6 - 17.3%) -- possible 6HKO
14
Yveltal
DarkFlying
SOFT CHECK
View matchup
478.726
12.1%
Standard error 1.49 points
▾
252+ SpA Life Orb Yveltal Oblivion Wing vs. 252 HP / 252+ SpD Arceus-Fairy: 121-142 (27.2 - 31.9%) -- guaranteed 4HKO
15
Chansey
Normal
SOFT CHECK
View matchup
42.249
33.9%
Standard error 7.28 points
▾
Chansey Seismic Toss vs. 252 HP Arceus-Fairy: 100-100 (22.5 - 22.5%) -- guaranteed 5HKO
16
Giratina-Origin
GhostDragon
SOFT CHECK
View matchup
123.606
10.6%
Standard error 2.76 points
▾
0- Atk Griseous Core Giratina-Origin Poltergeist vs. 252 HP / 0 Def Arceus-Fairy: 127-151 (28.6 - 34%) -- 0.9% chance to 3HKO
17
Chien-Pao
DarkIce
SOFT CHECK
View matchup
25.806
35.3%
Standard error 9.41 points
▾
252+ Atk Sword of Ruin Chien-Pao Icicle Crash vs. 252 HP / 0 Def Arceus-Fairy: 165-195 (37.1 - 43.9%) -- guaranteed 3HKO
18
Garganacl
Rock
SOFT CHECK
View matchup
26.85
31.8%
Standard error 8.99 points
▾
252+ Atk Garganacl Iron Head vs. 252 HP / 0 Def Arceus-Fairy: 136-162 (30.6 - 36.4%) -- 60.1% chance to 3HKO
19
Alomomola
Water
SOFT CHECK
View matchup
81.504
7.4%
Standard error 2.90 points
▾
252+ Atk Alomomola Flip Turn vs. 252 HP / 0 Def Arceus-Fairy: 64-76 (14.4 - 17.1%) -- possible 6HKO
20
Dondozo
Water
SOFT CHECK
View matchup
30.492
7.0%
Standard error 4.61 points
▾
252+ Atk Dondozo Wave Crash vs. 252 HP / 0 Def Arceus-Fairy: 153-181 (34.4 - 40.7%) -- guaranteed 3HKO
Ranked #14 with 11.16% usage. Sorted by conservative score.