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
Medicham-Mega
FightingPsychic
OFFENSIVE CHECK
View matchup
100.293
82.5%
Standard error 6.48 points
▾
252+ Atk Pure Power Medicham-Mega High Jump Kick vs. 252 HP / 0 Def Eviolite Chansey: 2652-3120 (376.7 - 443.1%) -- guaranteed OHKO
02
Excadrill
GroundSteel
OFFENSIVE CHECK
View matchup
94.883
77.1%
Standard error 7.43 points
▾
252+ Atk Excadrill Earthquake vs. 252 HP / 0 Def Eviolite Chansey: 630-742 (89.4 - 105.3%) -- 37.5% chance to OHKO
03
Serperior
Grass
DEFENSIVE CHECK
View matchup
58.931
74.2%
Standard error 7.46 points
▾
Chansey Seismic Toss vs. 252 HP Serperior: 100-100 (28.2 - 28.2%) -- guaranteed 5HKO after Leftovers recovery
04
Swampert-Mega
WaterGround
OFFENSIVE CHECK
View matchup
59.147
73.3%
Standard error 7.73 points
▾
252+ Atk Swampert-Mega Superpower vs. 252 HP / 0 Def Eviolite Chansey: 1088-1282 (154.5 - 182.1%) -- guaranteed OHKO
05
Kartana
GrassSteel
OFFENSIVE CHECK
View matchup
90.423
72.9%
Standard error 8.03 points
▾
252+ Atk Kartana Sacred Sword vs. 252 HP / 0 Def Eviolite Chansey: 946-1114 (134.3 - 158.2%) -- guaranteed OHKO
06
Seismitoad
WaterGround
OFFENSIVE CHECK
View matchup
25.552
74.8%
Standard error 8.59 points
▾
0- Atk Seismitoad Earthquake vs. 252 HP / 0 Def Eviolite Chansey: 316-373 (44.8 - 52.9%) -- 30.5% chance to 2HKO
07
Skarmory
SteelFlying
DEFENSIVE CHECK
View matchup
76.602
68.7%
Standard error 7.33 points
▾
Chansey Seismic Toss vs. 252 HP Skarmory: 100-100 (29.9 - 29.9%) -- guaranteed 4HKO
08
Ferrothorn
GrassSteel
DEFENSIVE CHECK
View matchup
158.453
63.7%
Standard error 6.53 points
▾
Chansey Seismic Toss vs. 252 HP Ferrothorn: 100-100 (28.4 - 28.4%) -- guaranteed 5HKO after Leftovers recovery
09
Gliscor
GroundFlying
DEFENSIVE CHECK
View matchup
109.638
55.1%
Standard error 6.72 points
▾
Chansey Seismic Toss vs. 252 HP Gliscor: 100-100 (28.2 - 28.2%) -- guaranteed 4HKO
10
Landorus-Therian
GroundFlying
SOFT CHECK
View matchup
239.652
49.6%
Standard error 5.50 points
▾
252+ Atk Landorus-Therian Explosion vs. 252 HP / 0 Def Eviolite Chansey: 1105-1301 (156.9 - 184.8%) -- guaranteed OHKO
11
Kyurem-Black
DragonIce
OFFENSIVE CHECK
View matchup
26.472
63.2%
Standard error 9.37 points
▾
252+ Atk Kyurem-Black Freeze Shock vs. 252 HP / 0 Def Eviolite Chansey: 1048-1234 (148.8 - 175.2%) -- guaranteed OHKO
12
Tornadus-Therian
Flying
SOFT CHECK
View matchup
177.295
44.0%
Standard error 6.33 points
▾
0- Atk Tornadus-Therian Knock Off (97.5 BP) vs. 252 HP / 0 Def Eviolite Chansey: 214-252 (30.3 - 35.7%) -- 39.9% chance to 3HKO
13
Heatran
FireSteel
SOFT CHECK
View matchup
132.352
46.3%
Standard error 7.44 points
▾
252+ SpA Heatran Magma Storm vs. 252 HP / 252+ SpD Eviolite Chansey: 84-100 (11.9 - 14.2%) -- 95.5% chance to 4HKO after trapping damage
14
Clefable
Fairy
SOFT CHECK
View matchup
106.748
45.6%
Standard error 8.25 points
▾
0- Atk Clefable Knock Off (97.5 BP) vs. 252 HP / 0 Def Eviolite Chansey: 159-188 (22.5 - 26.7%) -- 29.3% chance to 4HKO
15
Toxapex
PoisonWater
SOFT CHECK
View matchup
188.227
35.7%
Standard error 5.98 points
▾
0- Atk Toxapex Knock Off (97.5 BP) vs. 252 HP / 0 Def Eviolite Chansey: 147-173 (20.8 - 24.5%) -- guaranteed 5HKO
16
Hippowdon
Ground
SOFT CHECK
View matchup
27.123
49.5%
Standard error 9.60 points
▾
252+ Atk Hippowdon Earthquake vs. 252 HP / 0 Def Eviolite Chansey: 552-651 (78.4 - 92.4%) -- guaranteed 2HKO after sandstorm damage
17
Sableye-Mega
DarkGhost
SOFT CHECK
View matchup
43.601
53.3%
Standard error 10.67 points
▾
252+ Atk Sableye-Mega Knock Off (97.5 BP) vs. 252 HP / 0 Def Eviolite Chansey: 445-525 (63.2 - 74.5%) -- guaranteed 2HKO
18
Tapu Lele
PsychicFairy
SOFT CHECK
View matchup
26.187
49.4%
Standard error 9.77 points
▾
252+ SpA Choice Specs Tapu Lele Psyshock vs. 252 HP / 0 Def Eviolite Chansey in Psychic Terrain: 1102-1297 (156.5 - 184.2%) -- guaranteed OHKO
19
Chansey
Normal
SOFT CHECK
View matchup
119.772
39.6%
Standard error 7.59 points
▾
Chansey Seismic Toss vs. 252 HP Chansey: 100-100 (14.2 - 14.2%) -- guaranteed 8HKO
20
Magearna
SteelFairy
SOFT CHECK
View matchup
203.675
30.0%
Standard error 5.48 points
▾
252+ SpA Magearna Focus Blast vs. 252 HP / 252+ SpD Eviolite Chansey: 136-160 (19.3 - 22.7%) -- possible 5HKO
21
Tapu Fini
WaterFairy
SOFT CHECK
View matchup
75.321
38.6%
Standard error 7.85 points
▾
Tapu Fini Nature's Madness vs. 252 HP Chansey: 352-352 (50 - 50%) -- guaranteed 2HKO
22
Celesteela
SteelFlying
SOFT CHECK
View matchup
32.022
36.5%
Standard error 8.51 points
▾
252+ Atk Celesteela Heavy Slam (120 BP) vs. 252 HP / 0 Def Eviolite Chansey: 618-727 (87.7 - 103.2%) -- 25% chance to OHKO
23
Suicune
Water
SOFT CHECK
View matchup
23.857
39.7%
Standard error 10.02 points
▾
252+ SpA Suicune Scald vs. 252 HP / 252+ SpD Eviolite Chansey: 52-63 (7.3 - 8.9%)
24
Cresselia
Psychic
SOFT CHECK
View matchup
45.917
36.5%
Standard error 9.67 points
▾
252+ SpA Cresselia Psyshock vs. 252 HP / 0 Def Eviolite Chansey: 339-400 (48.1 - 56.8%) -- 89.1% chance to 2HKO
25
Greninja
WaterDark
SOFT CHECK
View matchup
215.347
13.6%
Standard error 4.01 points
▾
0- Atk Greninja Gunk Shot vs. 252 HP / 0 Def Eviolite Chansey: 253-298 (35.9 - 42.3%) -- guaranteed 3HKO
26
Tapu Koko
ElectricFairy
SOFT CHECK
View matchup
128.864
19.7%
Standard error 5.83 points
▾
Tapu Koko Nature's Madness vs. 252 HP Chansey: 352-352 (50 - 50%) -- guaranteed 2HKO
27
Latias-Mega
DragonPsychic
SOFT CHECK
View matchup
91.111
15.5%
Standard error 5.31 points
▾
252+ SpA Latias-Mega Draco Meteor vs. 252 HP / 252+ SpD Eviolite Chansey: 115-136 (16.3 - 19.3%) -- possible 6HKO
28
Diancie-Mega
RockFairy
SOFT CHECK
View matchup
28.431
27.8%
Standard error 8.41 points
▾
0- Atk Diancie-Mega Diamond Storm vs. 252 HP / 0 Def Eviolite Chansey: 498-586 (70.7 - 83.2%) -- guaranteed 2HKO
29
Charizard-Mega-Y
FireFlying
SOFT CHECK
View matchup
88.124
12.8%
Standard error 5.64 points
▾
252+ SpA Charizard-Mega-Y Overheat vs. 252 HP / 252+ SpD Eviolite Chansey in Sun: 190-225 (26.9 - 31.9%) -- guaranteed 4HKO
30
Pelipper
WaterFlying
SOFT CHECK
View matchup
51.379
9.2%
Standard error 5.23 points
▾
252+ Atk Pelipper Knock Off (97.5 BP) vs. 252 HP / 0 Def Eviolite Chansey: 220-259 (31.2 - 36.7%) -- 73.1% chance to 3HKO
Ranked #26 with 7.35% usage. Sorted by conservative score.