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
Chansey
Normal
DEFENSIVE CHECK
View matchup
55.836
82.3%
Standard error 5.11 points
▾
252+ SpA Charizard-Mega-Y Fire Blast vs. 252 HP / 252+ SpD Eviolite Chansey in Sun: 160-190 (22.7 - 26.9%) -- 44.2% chance to 4HKO
02
Latias-Mega
DragonPsychic
DEFENSIVE CHECK
View matchup
44.232
79.1%
Standard error 6.12 points
▾
252+ SpA Charizard-Mega-Y Fire Blast vs. 252 HP / 252+ SpD Latias-Mega in Sun: 93-110 (25.5 - 30.2%) -- guaranteed 4HKO
03
Dragonite
DragonFlying
OFFENSIVE CHECK
View matchup
22.029
83.0%
Standard error 8.00 points
▾
252+ Atk Dragonite Outrage vs. 252 HP / 0 Def Charizard-Mega-Y: 271-319 (75.2 - 88.6%) -- guaranteed 2HKO
04
Toxapex
PoisonWater
DEFENSIVE CHECK
View matchup
158.76
57.5%
Standard error 3.92 points
▾
252+ SpA Charizard-Mega-Y Fire Blast vs. 252 HP / 252+ SpD Toxapex in Sun: 97-114 (31.9 - 37.5%) -- 0.1% chance to 3HKO after Black Sludge recovery
05
Tapu Koko
ElectricFairy
OFFENSIVE CHECK
View matchup
69.475
58.8%
Standard error 5.91 points
▾
252+ SpA Tapu Koko Thunderbolt vs. 252 HP / 252+ SpD Charizard-Mega-Y in Electric Terrain: 254-302 (70.5 - 83.8%) -- guaranteed 2HKO
06
Greninja
WaterDark
SOFT CHECK
View matchup
74.259
50.5%
Standard error 5.80 points
▾
252+ SpA Choice Specs Greninja Hydro Pump vs. 252 HP / 252+ SpD Charizard-Mega-Y in Sun: 164-194 (45.5 - 53.8%) -- 41.4% chance to 2HKO
07
Landorus-Therian
GroundFlying
SOFT CHECK
View matchup
150.984
18.0%
Standard error 3.13 points
▾
252+ Atk Landorus-Therian Stone Edge vs. 252 HP / 0 Def Charizard-Mega-Y: 636-752 (176.6 - 208.8%) -- guaranteed OHKO
08
Heatran
FireSteel
SOFT CHECK
View matchup
58.044
24.7%
Standard error 5.66 points
▾
252+ SpA Heatran Magma Storm vs. 252 HP / 252+ SpD Charizard-Mega-Y in Sun: 88-104 (24.4 - 28.8%) -- guaranteed 3HKO after trapping damage
09
Pelipper
WaterFlying
SOFT CHECK
View matchup
65.764
16.1%
Standard error 4.53 points
▾
0- SpA Pelipper Surf vs. 252 HP / 252+ SpD Charizard-Mega-Y in Rain: 168-198 (46.6 - 55%) -- 64.8% chance to 2HKO
10
Charizard-Mega-Y
FireFlying
SOFT CHECK
View matchup
21.779
39.0%
Standard error 10.45 points
▾
252+ SpA Charizard-Mega-Y Fire Blast vs. 252 HP / 252+ SpD Charizard-Mega-Y in Sun: 113-133 (31.3 - 36.9%) -- 78.4% chance to 3HKO
11
Ferrothorn
GrassSteel
SOFT CHECK
View matchup
50.538
5.1%
Standard error 3.11 points
▾
252+ Atk Ferrothorn Knock Off vs. 252 HP / 0 Def Charizard-Mega-Y: 77-91 (21.3 - 25.2%) -- 0.1% chance to 4HKO
12
Skarmory
SteelFlying
SOFT CHECK
View matchup
44.522
5.1%
Standard error 3.29 points
▾
252+ Atk Skarmory Brave Bird vs. 252 HP / 0 Def Charizard-Mega-Y: 192-226 (53.3 - 62.7%) -- guaranteed 2HKO
13
Gliscor
GroundFlying
SOFT CHECK
View matchup
30.918
7.8%
Standard error 4.82 points
▾
252+ Atk Gliscor Facade vs. 252 HP / 0 Def Charizard-Mega-Y: 84-99 (23.3 - 27.5%) -- 75.2% chance to 4HKO
14
Clefable
Fairy
SOFT CHECK
View matchup
21.769
25.9%
Standard error 9.39 points
▾
252+ SpA Clefable Thunderbolt vs. 252 HP / 252+ SpD Charizard-Mega-Y: 114-136 (31.6 - 37.7%) -- 91.2% chance to 3HKO
15
Magearna
SteelFairy
SOFT CHECK
View matchup
20.104
18.1%
Standard error 8.59 points
▾
252+ SpA Magearna Thunderbolt vs. 252 HP / 252+ SpD Charizard-Mega-Y: 142-168 (39.4 - 46.6%) -- guaranteed 3HKO
16
Tornadus-Therian
Flying
SOFT CHECK
View matchup
21.18
12.2%
Standard error 7.12 points
▾
252+ SpA Tornadus-Therian Hurricane vs. 252 HP / 252+ SpD Charizard-Mega-Y: 115-136 (31.9 - 37.7%) -- 92.8% chance to 3HKO
Ranked #36 with 5.23% usage. Sorted by conservative score.