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-Cornerstone
GrassRock
OFFENSIVE CHECK
View matchup
23.291
98.2%
Standard error 2.73 points
▾
252+ Atk Cornerstone Mask Ogerpon-Cornerstone Ivy Cudgel vs. 252 HP / 0 Def Zapdos: 468-552 (121.8 - 143.7%) -- guaranteed OHKO
02
Diancie-Mega
RockFairy
OFFENSIVE CHECK
View matchup
190.16
96.5%
Standard error 2.31 points
▾
0- Atk Diancie-Mega Diamond Storm vs. 252 HP / 0 Def Zapdos: 336-396 (87.5 - 103.1%) -- 25% chance to OHKO
03
Kyurem
DragonIce
OFFENSIVE CHECK
View matchup
260.75
88.8%
Standard error 3.25 points
▾
252+ SpA Kyurem Ice Beam vs. 252 HP / 252+ SpD Zapdos: 252-296 (65.6 - 77%) -- guaranteed 2HKO
04
Tyranitar-Mega
RockDark
DEFENSIVE CHECK
View matchup
154.668
91.0%
Standard error 3.83 points
▾
252+ SpA Zapdos Thunderbolt vs. 252 HP / 252+ SpD Tyranitar-Mega in Sand: 67-79 (16.5 - 19.5%) -- possible 6HKO
05
Heatran
FireSteel
OFFENSIVE CHECK
View matchup
169.204
85.3%
Standard error 4.46 points
▾
252+ SpA Heatran Eruption (150 BP) vs. 252 HP / 252+ SpD Zapdos: 208-246 (54.1 - 64%) -- guaranteed 2HKO
06
Tapu Lele
PsychicFairy
OFFENSIVE CHECK
View matchup
192.616
81.3%
Standard error 4.66 points
▾
252+ SpA Tapu Lele Future Sight vs. 252 HP / 252+ SpD Zapdos in Psychic Terrain: 216-255 (56.2 - 66.4%) -- guaranteed 2HKO
07
Terapagos
Normal
DEFENSIVE CHECK
View matchup
208.34
80.6%
Standard error 4.64 points
▾
252+ SpA Zapdos Hurricane vs. 252 HP / 252+ SpD Terapagos: 153-181 (39.8 - 47.1%) -- guaranteed 3HKO
08
Latios-Mega
DragonPsychic
OFFENSIVE CHECK
View matchup
87.695
83.9%
Standard error 5.49 points
▾
252+ SpA Latios-Mega Draco Meteor vs. 252 HP / 252+ SpD Zapdos: 211-249 (54.9 - 64.8%) -- guaranteed 2HKO
09
Tyranitar
RockDark
OFFENSIVE CHECK
View matchup
69.079
83.6%
Standard error 6.19 points
▾
252+ Atk Choice Band Tyranitar Stone Edge vs. 252 HP / 0 Def Zapdos: 630-744 (164 - 193.7%) -- guaranteed OHKO
10
Hoopa-Unbound
PsychicDark
OFFENSIVE CHECK
View matchup
44.064
81.3%
Standard error 5.87 points
▾
252+ Atk Hoopa-Unbound Hyperspace Fury vs. 252 HP / 0 Def Zapdos: 240-283 (62.5 - 73.6%) -- guaranteed 2HKO
11
Clodsire
PoisonGround
DEFENSIVE CHECK
View matchup
280.121
73.5%
Standard error 4.34 points
▾
252+ SpA Zapdos Hurricane vs. 252 HP / 252+ SpD Clodsire: 138-163 (29.7 - 35.1%) -- guaranteed 4HKO after Black Sludge recovery
12
Charizard-Mega-Y
FireFlying
OFFENSIVE CHECK
View matchup
122.394
79.3%
Standard error 6.24 points
▾
252+ SpA Charizard-Mega-Y Overheat vs. 252 HP / 252+ SpD Zapdos in Sun: 313-370 (81.5 - 96.3%) -- guaranteed 2HKO
13
Dragonite
DragonFlying
OFFENSIVE CHECK
View matchup
246.662
72.6%
Standard error 4.88 points
▾
252+ Atk Dragonite Outrage vs. 252 HP / 0 Def Zapdos: 253-298 (65.8 - 77.6%) -- guaranteed 2HKO
14
Ceruledge
FireGhost
OFFENSIVE CHECK
View matchup
29.403
80.8%
Standard error 7.27 points
▾
252+ Atk Ceruledge Poltergeist vs. 252 HP / 0 Def Zapdos: 220-259 (57.2 - 67.4%) -- guaranteed 2HKO
15
Charizard-Mega-X
FireDragon
OFFENSIVE CHECK
View matchup
96.636
79.5%
Standard error 7.08 points
▾
252+ Atk Tough Claws Charizard-Mega-X Flare Blitz vs. 252 HP / 0 Def Zapdos: 321-378 (83.5 - 98.4%) -- guaranteed 2HKO
16
Clefable
Fairy
DEFENSIVE CHECK
View matchup
104.792
73.7%
Standard error 5.91 points
▾
252+ SpA Zapdos Hurricane vs. 252 HP / 252+ SpD Clefable: 148-175 (37.5 - 44.4%) -- guaranteed 3HKO after Leftovers recovery
17
Raging Bolt
ElectricDragon
OFFENSIVE CHECK
View matchup
351.643
66.3%
Standard error 4.33 points
▾
252+ SpA Choice Specs Raging Bolt Draco Meteor vs. 252 HP / 252+ SpD Zapdos: 280-331 (72.9 - 86.1%) -- guaranteed 2HKO
18
Ursaluna
GroundNormal
OFFENSIVE CHECK
View matchup
140.545
73.0%
Standard error 6.41 points
▾
252+ Atk Ursaluna Ice Punch vs. 252 HP / 0 Def Zapdos: 218-258 (56.7 - 67.1%) -- guaranteed 2HKO
19
Garchomp
DragonGround
OFFENSIVE CHECK
View matchup
290.112
66.3%
Standard error 4.74 points
▾
252+ Atk Garchomp Stone Edge vs. 252 HP / 0 Def Zapdos: 274-324 (71.3 - 84.3%) -- guaranteed 2HKO
20
Garchomp-Mega
DragonGround
OFFENSIVE CHECK
20.65
80.6%
Standard error 8.70 points
21
Gliscor
GroundFlying
DEFENSIVE CHECK
View matchup
580.076
59.0%
Standard error 3.45 points
▾
252+ SpA Zapdos Hidden Power Ice vs. 252 HP / 252+ SpD Gliscor: 244-288 (68.9 - 81.3%) -- guaranteed 2HKO
22
Archaludon
SteelDragon
DEFENSIVE CHECK
View matchup
22.665
78.5%
Standard error 8.63 points
▾
252+ SpA Zapdos Heat Wave vs. 252 HP / 252+ SpD Assault Vest Archaludon: 70-83 (18.2 - 21.6%) -- possible 5HKO
23
Volcarona
BugFire
OFFENSIVE CHECK
View matchup
43.244
70.8%
Standard error 6.92 points
▾
252+ SpA Volcarona Flamethrower vs. 252 HP / 252+ SpD Zapdos: 129-153 (33.5 - 39.8%) -- guaranteed 3HKO
24
Ting-Lu
DarkGround
DEFENSIVE CHECK
View matchup
307.982
61.3%
Standard error 4.71 points
▾
252+ SpA Zapdos Hurricane vs. 252 HP / 252+ SpD Vessel of Ruin Ting-Lu: 120-142 (23.3 - 27.6%) -- possible 5HKO
25
Zamazenta
Fighting
OFFENSIVE CHECK
View matchup
491.197
55.5%
Standard error 3.79 points
▾
252+ Atk Zamazenta Stone Edge vs. 252 HP / 0 Def Zapdos: 260-306 (67.7 - 79.6%) -- guaranteed 2HKO
26
Gholdengo
SteelGhost
OFFENSIVE CHECK
View matchup
409.644
55.3%
Standard error 4.18 points
▾
252+ SpA Gholdengo Shadow Ball vs. 252 HP / 252+ SpD Zapdos: 114-135 (29.6 - 35.1%) -- 15.6% chance to 3HKO
27
Blaziken
FireFighting
OFFENSIVE CHECK
View matchup
22.744
74.8%
Standard error 9.11 points
▾
252+ Atk Blaziken Stone Edge vs. 252 HP / 0 Def Zapdos: 260-306 (67.7 - 79.6%) -- guaranteed 2HKO
28
Iron Valiant
FairyFighting
OFFENSIVE CHECK
View matchup
164.621
60.2%
Standard error 6.32 points
▾
252+ Atk Iron Valiant Spirit Break vs. 252 HP / 0 Def Zapdos: 154-183 (40.1 - 47.6%) -- guaranteed 3HKO
29
Blissey
Normal
DEFENSIVE CHECK
View matchup
104.018
60.9%
Standard error 6.50 points
▾
252+ SpA Zapdos Hurricane vs. 252 HP / 252+ SpD Blissey: 112-133 (15.6 - 18.6%) -- possible 6HKO
30
Ogerpon-Wellspring
GrassWater
SOFT CHECK
View matchup
358.889
52.6%
Standard error 4.45 points
▾
252+ Atk Wellspring Mask Ogerpon-Wellspring Ivy Cudgel vs. 252 HP / 0 Def Zapdos: 234-276 (60.9 - 71.8%) -- guaranteed 2HKO
Ranked #10 with 14.16% usage. Sorted by conservative score.