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
Yveltal
DarkFlying
OFFENSIVE CHECK
View matchup
676.087
58.8%
Standard error 3.26 points
▾
252+ SpA Life Orb Yveltal Oblivion Wing vs. 252 HP / 252+ SpD Marshadow: 291-346 (75.7 - 90.1%) -- guaranteed 2HKO
02
Groudon-Primal
GroundFire
SOFT CHECK
View matchup
714.066
51.5%
Standard error 3.22 points
▾
252+ Atk Groudon-Primal Heat Crash (120 BP) vs. 252 HP / 0 Def Marshadow in Harsh Sunshine: 498-586 (129.6 - 152.6%) -- guaranteed OHKO
03
Zygarde
DragonGround
SOFT CHECK
View matchup
720.331
51.5%
Standard error 3.22 points
▾
252+ Atk Zygarde Thousand Arrows vs. 252 HP / 0 Def Marshadow: 162-192 (42.1 - 50%) -- 0.4% chance to 2HKO
04
Chien-Pao
DarkIce
OFFENSIVE CHECK
View matchup
146.036
65.2%
Standard error 6.73 points
▾
252+ Atk Sword of Ruin Chien-Pao Icicle Crash vs. 252 HP / 0 Def Marshadow: 231-273 (60.1 - 71%) -- guaranteed 2HKO
05
Arceus-Fairy
Fairy
DEFENSIVE CHECK
View matchup
202.058
61.4%
Standard error 5.88 points
▾
252+ Atk Marshadow Poltergeist vs. 252 HP / 252+ Def Arceus-Fairy: 123-145 (27.7 - 32.6%) -- guaranteed 4HKO
06
Eternatus
PoisonDragon
OFFENSIVE CHECK
View matchup
284.476
57.4%
Standard error 4.92 points
▾
252+ SpA Eternatus Draco Meteor vs. 252 HP / 252+ SpD Marshadow: 195-231 (50.7 - 60.1%) -- guaranteed 2HKO
07
Dondozo
Water
SOFT CHECK
View matchup
223.262
54.9%
Standard error 5.57 points
▾
252+ Atk Dondozo Liquidation vs. 252 HP / 0 Def Marshadow: 153-181 (39.8 - 47.1%) -- guaranteed 3HKO
08
Zacian-Crowned
FairySteel
SOFT CHECK
View matchup
733.424
43.7%
Standard error 3.13 points
▾
+1 252+ Atk Zacian-Crowned Play Rough vs. 252 HP / 0 Def Marshadow: 648-764 (168.7 - 198.9%) -- guaranteed OHKO
09
Marshadow
FightingGhost
SOFT CHECK
View matchup
369.443
48.2%
Standard error 4.40 points
▾
252+ Atk Marshadow Poltergeist vs. 252 HP / 0 Def Marshadow: 462-546 (120.3 - 142.1%) -- guaranteed OHKO
10
Garganacl
Rock
DEFENSIVE CHECK
View matchup
21.274
67.3%
Standard error 10.17 points
▾
252+ Atk Marshadow Close Combat vs. 252 HP / 252+ Def Garganacl: 252-296 (62.3 - 73.2%) -- guaranteed 2HKO after Leftovers recovery
11
Mewtwo
Psychic
OFFENSIVE CHECK
View matchup
27.552
62.3%
Standard error 9.23 points
▾
252+ SpA Mewtwo Psystrike vs. 252 HP / 0 Def Marshadow: 492-578 (128.1 - 150.5%) -- guaranteed OHKO
12
Melmetal
Steel
DEFENSIVE CHECK
View matchup
108.139
57.8%
Standard error 8.13 points
▾
252+ Atk Marshadow Close Combat vs. 252 HP / 252+ Def Melmetal: 236-278 (49.7 - 58.6%) -- 98.4% chance to 2HKO
13
Ho-Oh
FireFlying
SOFT CHECK
View matchup
476.43
34.2%
Standard error 3.75 points
▾
252+ Atk Ho-Oh Brave Bird vs. 252 HP / 0 Def Marshadow: 518-612 (134.8 - 159.3%) -- guaranteed OHKO
14
Salamence-Mega
DragonFlying
SOFT CHECK
View matchup
71.071
54.0%
Standard error 10.20 points
▾
252+ Atk Aerilate Salamence-Mega Double-Edge vs. 252 HP / 0 Def Marshadow: 674-794 (175.5 - 206.7%) -- guaranteed OHKO
15
Kyogre-Primal
Water
SOFT CHECK
View matchup
282.174
31.7%
Standard error 4.76 points
▾
252+ SpA Kyogre-Primal Water Spout (150 BP) vs. 252 HP / 252+ SpD Marshadow in Heavy Rain: 399-469 (103.9 - 122.1%) -- guaranteed OHKO
16
Arceus
Normal
SOFT CHECK
View matchup
274.341
31.4%
Standard error 4.84 points
▾
252+ Atk Life Orb Arceus Shadow Claw vs. 252 HP / 0 Def Marshadow: 250-294 (65.1 - 76.5%) -- guaranteed 2HKO
17
Necrozma-Dusk-Mane
PsychicSteel
SOFT CHECK
View matchup
315.311
27.7%
Standard error 4.31 points
▾
252+ SpA Necrozma-Dusk-Mane Photon Geyser vs. 252 HP / 252+ SpD Marshadow: 254-300 (66.1 - 78.1%) -- guaranteed 2HKO
18
Arceus-Ground
Ground
SOFT CHECK
View matchup
194.714
33.1%
Standard error 5.82 points
▾
0- Atk Earth Plate Arceus-Ground Earthquake vs. 252 HP / 0 Def Marshadow: 163-193 (42.4 - 50.2%) -- 0.4% chance to 2HKO
19
Alomomola
Water
SOFT CHECK
View matchup
220.93
30.3%
Standard error 5.28 points
▾
252+ Atk Alomomola Knock Off (97.5 BP) vs. 252 HP / 0 Def Marshadow: 97-115 (25.2 - 29.9%) -- guaranteed 4HKO
20
Ditto
Normal
SOFT CHECK
View matchup
101.379
41.0%
Standard error 8.03 points
▾
Ditto vs. Marshadow: 0-0 (0 - 0%)
21
Giratina-Origin
GhostDragon
SOFT CHECK
View matchup
195.541
30.8%
Standard error 5.61 points
▾
0- Atk Griseous Core Giratina-Origin Poltergeist vs. 252 HP / 0 Def Marshadow: 360-426 (93.7 - 110.9%) -- 62.5% chance to OHKO
22
Rayquaza
DragonFlying
SOFT CHECK
View matchup
46.987
33.2%
Standard error 6.87 points
▾
252+ Atk Choice Band Rayquaza Dragon Ascent vs. 252 HP / 0 Def Marshadow: 864-1016 (225 - 264.5%) -- guaranteed OHKO
23
Arceus-Dark
Dark
SOFT CHECK
View matchup
198.734
25.5%
Standard error 5.32 points
▾
0- Atk Dread Plate Arceus-Dark Foul Play vs. 252 HP / 0 Def Marshadow: 160-190 (41.6 - 49.4%) -- guaranteed 3HKO
24
Calyrex-Ice
PsychicIce
SOFT CHECK
View matchup
115.055
34.5%
Standard error 7.63 points
▾
252+ Atk Calyrex-Ice Glacial Lance vs. 252 HP / 0 Def Marshadow: 310-366 (80.7 - 95.3%) -- guaranteed 2HKO
25
Deoxys-Attack
Psychic
SOFT CHECK
View matchup
65.307
33.7%
Standard error 8.05 points
▾
252+ SpA Life Orb Deoxys-Attack Psycho Boost vs. 252 HP / 252+ SpD Marshadow: 642-759 (167.1 - 197.6%) -- guaranteed OHKO
26
Lunala
PsychicGhost
SOFT CHECK
View matchup
62.307
34.7%
Standard error 8.53 points
▾
252+ SpA Lunala Psyshock vs. 252 HP / 0 Def Marshadow: 360-426 (93.7 - 110.9%) -- 62.5% chance to OHKO
27
Mewtwo-Mega-X
PsychicFighting
SOFT CHECK
View matchup
72.991
19.0%
Standard error 6.41 points
▾
252+ Atk Mewtwo-Mega-X Zen Headbutt vs. 252 HP / 0 Def Marshadow: 462-546 (120.3 - 142.1%) -- guaranteed OHKO
28
Ferrothorn
GrassSteel
SOFT CHECK
View matchup
94.86
19.6%
Standard error 6.99 points
▾
252+ Atk Ferrothorn Power Whip vs. 252 HP / 0 Def Marshadow: 208-246 (54.1 - 64%) -- guaranteed 2HKO
29
Chansey
Normal
SOFT CHECK
View matchup
105.734
5.2%
Standard error 3.46 points
▾
30
Deoxys-Speed
Psychic
SOFT CHECK
View matchup
73.329
5.0%
Standard error 3.53 points
▾
252+ SpA Deoxys-Speed Psycho Boost vs. 252 HP / 252+ SpD Marshadow: 312-368 (81.2 - 95.8%) -- guaranteed 2HKO
Ranked #4 with 31.79% usage. Sorted by conservative score.