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
Ogerpon-Wellspring
GrassWater
OFFENSIVE CHECK
View matchup
79.651
67.8%
Standard error 7.38 points
▾
252+ Atk Wellspring Mask Ogerpon-Wellspring Power Whip vs. 252 HP / 0 Def Swampert-Mega: 900-1060 (222.7 - 262.3%) -- guaranteed OHKO
02
Dragonite
DragonFlying
OFFENSIVE CHECK
View matchup
24.178
69.9%
Standard error 9.33 points
▾
252+ Atk Dragonite Outrage vs. 252 HP / 0 Def Swampert-Mega: 204-240 (50.4 - 59.4%) -- guaranteed 2HKO
03
Zamazenta
Fighting
OFFENSIVE CHECK
View matchup
65.92
56.6%
Standard error 8.63 points
▾
252+ Atk Zamazenta Close Combat vs. 252 HP / 0 Def Swampert-Mega: 187-222 (46.2 - 54.9%) -- 64.5% chance to 2HKO
04
Charizard-Mega-Y
FireFlying
OFFENSIVE CHECK
View matchup
28.594
56.0%
Standard error 9.28 points
▾
252+ SpA Charizard-Mega-Y Solar Beam vs. 252 HP / 252+ SpD Swampert-Mega: 452-532 (111.8 - 131.6%) -- guaranteed OHKO
05
Terapagos
Normal
SOFT CHECK
View matchup
58.063
46.8%
Standard error 9.16 points
▾
0- SpA Terapagos Tera Starstorm vs. 252 HP / 252+ SpD Swampert-Mega: 55-66 (13.6 - 16.3%) -- possible 7HKO
06
Corviknight
FlyingSteel
SOFT CHECK
View matchup
25.268
47.9%
Standard error 9.94 points
▾
252+ Atk Corviknight Brave Bird vs. 252 HP / 0 Def Swampert-Mega: 153-180 (37.8 - 44.5%) -- guaranteed 3HKO
07
Zapdos
ElectricFlying
SOFT CHECK
View matchup
57.709
40.3%
Standard error 9.07 points
▾
252+ SpA Zapdos Hurricane vs. 252 HP / 252+ SpD Swampert-Mega: 130-154 (32.1 - 38.1%) -- 96% chance to 3HKO
08
Alomomola
Water
SOFT CHECK
View matchup
184.339
25.8%
Standard error 5.51 points
▾
252+ Atk Alomomola Flip Turn vs. 252 HP / 0 Def Swampert-Mega: 69-82 (17 - 20.2%) -- possible 5HKO
09
Kingambit
DarkSteel
SOFT CHECK
View matchup
50.046
37.6%
Standard error 9.66 points
▾
252+ Atk Black Glasses Kingambit Kowtow Cleave vs. 252 HP / 0 Def Swampert-Mega: 174-205 (43 - 50.7%) -- 2.3% chance to 2HKO
10
Raging Bolt
ElectricDragon
SOFT CHECK
View matchup
111.225
18.5%
Standard error 6.25 points
▾
252+ SpA Choice Specs Raging Bolt Draco Meteor vs. 252 HP / 252+ SpD Swampert-Mega: 246-289 (60.8 - 71.5%) -- guaranteed 2HKO
11
Tornadus-Therian
Flying
SOFT CHECK
View matchup
25.492
28.7%
Standard error 8.96 points
▾
252+ SpA Tornadus-Therian Hurricane vs. 252 HP / 252+ SpD Swampert-Mega: 118-141 (29.2 - 34.9%) -- 11.1% chance to 3HKO
12
Gholdengo
SteelGhost
SOFT CHECK
View matchup
100.152
18.0%
Standard error 6.55 points
▾
252+ SpA Gholdengo Shadow Ball vs. 252 HP / 252+ SpD Swampert-Mega: 99-117 (24.5 - 28.9%) -- 99.4% chance to 4HKO
13
Landorus-Therian
GroundFlying
SOFT CHECK
View matchup
65.73
12.7%
Standard error 5.79 points
▾
252+ Atk Landorus-Therian Explosion vs. 252 HP / 0 Def Swampert-Mega: 299-352 (74 - 87.1%) -- guaranteed 2HKO
14
Garchomp
DragonGround
SOFT CHECK
View matchup
20.315
30.0%
Standard error 10.16 points
▾
252+ Atk Garchomp Outrage vs. 252 HP / 0 Def Swampert-Mega: 199-235 (49.2 - 58.1%) -- 98% chance to 2HKO
15
Diancie-Mega
RockFairy
SOFT CHECK
View matchup
20.945
16.8%
Standard error 8.17 points
▾
252+ SpA Diancie-Mega Moonblast vs. 252 HP / 252+ SpD Swampert-Mega: 135-159 (33.4 - 39.3%) -- guaranteed 3HKO
Ranked #60 with 2.63% usage. Sorted by conservative score.