Reliability ranks observed matchups; KO rate is how often the checker knocked out or forced out the target. “Checker faints” reports the checker's own observed death rate. Categories use matchup reliability plus offensive and defensive base stats.
How to read this table
Use encounter count to judge sample size. A high-reliability check with a modest KO rate can still be useful when it consistently forces switches or limits the target.
#
Checker
Encounters
Reliability
KO Rate
01
Zacian-Crowned
FairySteel
OFFENSIVE CHECK
1,000.45
81.0%
checker faints 2.14%
▾
+1 252+ Atk Zacian-Crowned Iron Head vs. 252 HP / 0 Def Arceus-Fairy: 408-482 (91.8 - 108.5%) -- 56.3% chance to OHKO
02
Necrozma-Dusk-Mane
PsychicSteel
OFFENSIVE CHECK
902.289
68.8%
checker faints 2.66%
▾
0- Atk Necrozma-Dusk-Mane Sunsteel Strike vs. 252 HP / 0 Def Arceus-Fairy: 246-290 (55.4 - 65.3%) -- guaranteed 2HKO
03
Eternatus
PoisonDragon
OFFENSIVE CHECK
805.652
68.0%
checker faints 2.81%
▾
252+ SpA Eternatus Sludge Bomb vs. 252 HP / 252+ SpD Arceus-Fairy: 222-264 (50 - 59.4%) -- guaranteed 2HKO
04
Arceus-Electric
Electric
DEFENSIVE COUNTER
151.075
67.3%
checker faints 6.48%
▾
252+ SpA Pixie Plate Arceus-Fairy Judgment vs. 252 HP / 252+ SpD Arceus-Electric: 129-153 (29 - 34.4%) -- 3.1% chance to 3HKO
05
Clodsire
PoisonGround
DEFENSIVE COUNTER
160.682
64.1%
checker faints 6.39%
▾
252+ SpA Pixie Plate Arceus-Fairy Judgment vs. 252 HP / 252+ SpD Clodsire: 73-87 (15.7 - 18.7%) -- possible 6HKO
06
Arceus-Ground
Ground
DEFENSIVE COUNTER
315.025
61.0%
checker faints 4.73%
▾
252+ SpA Pixie Plate Arceus-Fairy Judgment vs. 252 HP / 252+ SpD Arceus-Ground: 129-153 (29 - 34.4%) -- 3.1% chance to 3HKO
07
Blissey
Normal
DEFENSIVE COUNTER
261.291
60.3%
checker faints 5.06%
▾
252+ SpA Pixie Plate Arceus-Fairy Judgment vs. 252 HP / 252+ SpD Blissey: 118-141 (16.5 - 19.7%) -- possible 6HKO
08
Calyrex-Ice
PsychicIce
DEFENSIVE COUNTER
391.262
59.6%
checker faints 4.28%
▾
252+ SpA Pixie Plate Arceus-Fairy Judgment vs. 252 HP / 252+ SpD Calyrex-Ice: 123-145 (30.4 - 35.8%) -- 45.3% chance to 3HKO
09
Kyogre
Water
DEFENSIVE COUNTER
1,413.047
59.3%
checker faints 2.26%
▾
252+ SpA Pixie Plate Arceus-Fairy Judgment vs. 252 HP / 252+ SpD Kyogre: 117-138 (28.9 - 34.1%) -- 2.1% chance to 3HKO
10
Ursaluna
GroundNormal
OFFENSIVE CHECK
69.995
57.0%
checker faints 8.19%
▾
252+ Atk Ursaluna Headlong Rush vs. 252 HP / 0 Def Arceus-Fairy: 195-229 (43.9 - 51.5%) -- 8.6% chance to 2HKO
11
Amoonguss
GrassPoison
DEFENSIVE COUNTER
43.732
56.5%
checker faints 10.54%
▾
252+ SpA Pixie Plate Arceus-Fairy Judgment vs. 252 HP / 252+ SpD Amoonguss: 84-100 (19.4 - 23.1%) -- possible 6HKO
12
Toxapex
PoisonWater
DEFENSIVE COUNTER
22.776
55.9%
checker faints 10.40%
▾
252+ SpA Pixie Plate Arceus-Fairy Judgment vs. 252 HP / 252+ SpD Toxapex: 57-68 (18.7 - 22.3%) -- possible 5HKO
13
Arceus-Ghost
Ghost
DEFENSIVE COUNTER
109.654
55.4%
checker faints 6.69%
▾
252+ SpA Pixie Plate Arceus-Fairy Judgment vs. 252 HP / 252+ SpD Arceus-Ghost: 129-153 (29 - 34.4%) -- 3.1% chance to 3HKO
14
Wo-Chien
DarkGrass
DEFENSIVE COUNTER
31.745
55.1%
checker faints 8.83%
▾
252+ SpA Pixie Plate Arceus-Fairy Judgment vs. 252 HP / 252+ SpD Wo-Chien: 236-282 (63.1 - 75.4%) -- guaranteed 2HKO
15
Terapagos
Normal
SOFT CHECK
161.863
53.3%
checker faints 6.73%
▾
0- SpA Terapagos Tera Starstorm vs. 252 HP / 252+ SpD Arceus-Fairy: 52-63 (11.7 - 14.1%) -- possible 8HKO
16
Glimmora
RockPoison
SOFT CHECK
140.124
52.8%
checker faints 6.91%
▾
0- SpA Glimmora Sludge Bomb vs. 252 HP / 252+ SpD Arceus-Fairy: 140-168 (31.5 - 37.8%) -- 89% chance to 3HKO
17
Lunala
PsychicGhost
SOFT CHECK
680.432
50.8%
checker faints 3.29%
▾
+1 252+ SpA Lunala Meteor Beam vs. 252 HP / 252+ SpD Arceus-Fairy: 142-168 (31.9 - 37.8%) -- 93.9% chance to 3HKO
18
545.878
50.4%
checker faints 3.65%
▾
252+ Atk Silk Scarf Arceus Double-Edge vs. 252 HP / 0 Def Arceus-Fairy: 210-247 (47.2 - 55.6%) -- 76.2% chance to 2HKO
19
Kingambit
DarkSteel
SOFT CHECK
226.987
48.1%
checker faints 5.64%
▾
252+ Atk Kingambit Iron Head vs. 252 HP / 0 Def Arceus-Fairy: 254-300 (57.2 - 67.5%) -- guaranteed 2HKO
20
Flutter Mane
GhostFairy
SOFT CHECK
81.905
47.7%
checker faints 9.42%
▾
252+ SpA Choice Specs Flutter Mane Moonblast vs. 252 HP / 252+ SpD Arceus-Fairy: 168-198 (37.8 - 44.5%) -- guaranteed 3HKO
21
Arceus-Fairy
Fairy
SOFT CHECK
445.454
47.7%
checker faints 4.07%
▾
252+ SpA Pixie Plate Arceus-Fairy Judgment vs. 252 HP / 252+ SpD Arceus-Fairy: 129-153 (29 - 34.4%) -- 3.1% chance to 3HKO
22
Arceus-Water
Water
SOFT CHECK
280.93
47.6%
checker faints 5.10%
▾
252+ SpA Splash Plate Arceus-Water Judgment vs. 252 HP / 252+ SpD Arceus-Fairy: 129-153 (29 - 34.4%) -- 3.1% chance to 3HKO
23
Ho-Oh
FireFlying
SOFT CHECK
1,569.243
46.7%
checker faints 2.16%
▾
252+ Atk Ho-Oh Brave Bird vs. 252 HP / 0 Def Arceus-Fairy: 184-217 (41.4 - 48.8%) -- guaranteed 3HKO
24
Deoxys-Attack
Psychic
SOFT CHECK
143.056
45.5%
checker faints 7.16%
▾
252+ SpA Deoxys-Attack Psycho Boost vs. 252 HP / 252+ SpD Arceus-Fairy: 204-241 (45.9 - 54.2%) -- 54.3% chance to 2HKO
25
Garganacl
Rock
SOFT CHECK
77.869
44.1%
checker faints 7.82%
▾
252+ Atk Garganacl Earthquake vs. 252 HP / 0 Def Arceus-Fairy: 85-101 (19.1 - 22.7%) -- possible 5HKO
26
Skeledirge
FireGhost
SOFT CHECK
138.365
43.7%
checker faints 7.12%
▾
252+ SpA Skeledirge Torch Song vs. 252 HP / 252+ SpD Arceus-Fairy: 82-97 (18.4 - 21.8%) -- possible 5HKO
27
Koraidon
FightingDragon
SOFT CHECK
2,884.472
39.5%
checker faints 1.56%
▾
252+ Atk Orichalcum Pulse Koraidon Flare Blitz vs. 252 HP / 0 Def Arceus-Fairy in Sun: 253-298 (56.9 - 67.1%) -- guaranteed 2HKO
28
Palkia-Origin
WaterDragon
SOFT CHECK
35.752
38.1%
checker faints 8.12%
▾
252+ SpA Lustrous Globe Palkia-Origin Hydro Pump vs. 252 HP / 252+ SpD Arceus-Fairy: 168-198 (37.8 - 44.5%) -- guaranteed 3HKO
29
132.221
31.5%
checker faints 6.93%
▾
Ditto vs. Arceus-Fairy: 0-0 (0 - 0%)
30
Kyurem-Black
DragonIce
SOFT CHECK
75.844
28.6%
checker faints 8.95%
▾
252+ Atk Kyurem-Black Iron Head vs. 252 HP / 0 Def Arceus-Fairy: 202-238 (45.4 - 53.6%) -- 38.7% chance to 2HKO
Ranked #9 with 16.49% usage. Sorted by reliability score.