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
Grafaiai
PoisonNormal
OFFENSIVE CHECK
26.975
85.4%
checker faints 6.81%
▾
252+ Atk Grafaiai Dig vs. 252 HP / 0 Def Eternatus: 162-192 (33.4 - 39.6%) -- guaranteed 3HKO
02
Arceus-Ground
Ground
DEFENSIVE COUNTER
169.104
85.3%
checker faints 4.58%
▾
252+ SpA Eternatus Dynamax Cannon vs. 252 HP / 252+ SpD Arceus-Ground: 124-147 (27.9 - 33.1%) -- guaranteed 4HKO
03
Necrozma-Dusk-Mane
PsychicSteel
OFFENSIVE CHECK
75.171
78.1%
checker faints 6.73%
▾
252+ Atk Necrozma-Dusk-Mane Photon Geyser vs. 252 HP / 0 Def Eternatus: 432-510 (89.2 - 105.3%) -- 31.3% chance to OHKO
04
Calyrex-Shadow
PsychicGhost
OFFENSIVE CHECK
337.108
75.2%
checker faints 3.88%
▾
252+ SpA Calyrex-Shadow Psyshock vs. 252 HP / 0 Def Eternatus: 360-426 (74.3 - 88%) -- guaranteed 2HKO
05
Calyrex-Ice
PsychicIce
DEFENSIVE COUNTER
31.151
74.6%
checker faints 7.80%
▾
252+ SpA Eternatus Flamethrower vs. 252 HP / 252+ SpD Calyrex-Ice: 140-166 (34.6 - 41%) -- guaranteed 3HKO
06
Terapagos
Normal
DEFENSIVE COUNTER
23.21
69.5%
checker faints 9.55%
▾
252+ SpA Eternatus Dynamax Cannon vs. 252 HP / 252+ SpD Terapagos: 156-184 (40.6 - 47.9%) -- guaranteed 3HKO
07
Zacian-Crowned
FairySteel
OFFENSIVE CHECK
99.955
68.6%
checker faints 6.32%
▾
+1 252+ Atk Zacian-Crowned Play Rough vs. 252 HP / 0 Def Eternatus: 280-331 (57.8 - 68.3%) -- guaranteed 2HKO
08
Koraidon
FightingDragon
OFFENSIVE CHECK
293.502
64.9%
checker faints 4.67%
▾
252+ Atk Orichalcum Pulse Koraidon Outrage vs. 252 HP / 0 Def Eternatus: 614-726 (126.8 - 150%) -- guaranteed OHKO
09
Ting-Lu
DarkGround
DEFENSIVE COUNTER
135.115
61.9%
checker faints 6.82%
▾
252+ SpA Eternatus Dynamax Cannon vs. 252 HP / 252+ SpD Vessel of Ruin Ting-Lu: 121-144 (23.5 - 28%) -- possible 5HKO
10
Arceus
Normal
DEFENSIVE COUNTER
248.634
60.2%
checker faints 5.01%
▾
252+ SpA Eternatus Dynamax Cannon vs. 252 HP / 252+ SpD Arceus: 124-147 (27.9 - 33.1%) -- guaranteed 4HKO
11
Flutter Mane
GhostFairy
OFFENSIVE CHECK
24.657
59.9%
checker faints 9.87%
▾
252+ SpA Flutter Mane Moonblast vs. 252 HP / 252+ SpD Eternatus: 130-154 (26.8 - 31.8%) -- guaranteed 4HKO
12
Miraidon
ElectricDragon
OFFENSIVE CHECK
452.189
58.9%
checker faints 3.92%
▾
252+ SpA Hadron Engine Miraidon Draco Meteor vs. 252 HP / 252+ SpD Eternatus: 476-564 (98.3 - 116.5%) -- 87.5% chance to OHKO
13
Iron Treads
GroundSteel
SOFT CHECK
157.566
54.7%
checker faints 6.57%
▾
252+ Atk Iron Treads Earthquake vs. 252 HP / 0 Def Eternatus: 338-398 (69.8 - 82.2%) -- guaranteed 2HKO
14
Garganacl
Rock
SOFT CHECK
21.576
49.4%
checker faints 10.76%
▾
252+ Atk Garganacl Salt Cure vs. 252 HP / 0 Def Eternatus: 63-75 (13 - 15.4%) -- possible 7HKO
15
Kingambit
DarkSteel
SOFT CHECK
28.478
47.7%
checker faints 9.36%
▾
252+ Atk Kingambit Zen Headbutt vs. 252 HP / 0 Def Eternatus: 206-244 (42.5 - 50.4%) -- 1.2% chance to 2HKO
16
Eternatus
PoisonDragon
SOFT CHECK
85.871
46.5%
checker faints 7.51%
▾
252+ SpA Eternatus Dynamax Cannon vs. 252 HP / 252+ SpD Eternatus: 290-344 (59.9 - 71%) -- guaranteed 2HKO
17
153.34
45.9%
checker faints 6.69%
▾
252+ SpA Kyogre Ice Beam vs. 252 HP / 252+ SpD Eternatus: 180-212 (37.1 - 43.8%) -- guaranteed 3HKO
18
Clodsire
PoisonGround
SOFT CHECK
187.448
43.3%
checker faints 6.11%
▾
252+ Atk Clodsire Earthquake vs. 252 HP / 0 Def Eternatus: 260-308 (53.7 - 63.6%) -- guaranteed 2HKO
19
Hatterene
PsychicFairy
SOFT CHECK
76.137
38.3%
checker faints 7.79%
▾
252+ SpA Hatterene Psyshock vs. 252 HP / 0 Def Eternatus: 312-368 (64.4 - 76%) -- guaranteed 2HKO
20
Smeargle
Normal
SOFT CHECK
133.579
37.6%
checker faints 6.90%
▾
252+ Atk Smeargle Nuzzle vs. 252 HP / 0 Def Eternatus: 5-6 (1 - 1.2%)
21
110.721
36.2%
checker faints 7.78%
▾
Ditto vs. Eternatus: 0-0 (0 - 0%)
22
Gliscor
GroundFlying
SOFT CHECK
175.606
33.1%
checker faints 6.06%
▾
252+ Atk Gliscor Earthquake vs. 252 HP / 0 Def Eternatus: 302-356 (62.3 - 73.5%) -- guaranteed 2HKO
23
Toxapex
PoisonWater
SOFT CHECK
31.652
31.6%
checker faints 8.27%
▾
252+ Atk Toxapex Liquidation vs. 252 HP / 0 Def Eternatus: 51-60 (10.5 - 12.3%) -- possible 9HKO
24
Arceus-Fairy
Fairy
SOFT CHECK
93.596
30.4%
checker faints 6.70%
▾
252+ SpA Pixie Plate Arceus-Fairy Judgment vs. 252 HP / 252+ SpD Eternatus: 153-180 (31.6 - 37.1%) -- 82.5% chance to 3HKO
25
Grimmsnarl
DarkFairy
SOFT CHECK
58.123
27.5%
checker faints 8.21%
▾
252+ Atk Grimmsnarl Play Rough vs. 252 HP / 0 Def Eternatus: 160-189 (33 - 39%) -- 99.8% chance to 3HKO
26
Ho-Oh
FireFlying
SOFT CHECK
473.528
27.0%
checker faints 3.47%
▾
252+ Atk Ho-Oh Earthquake vs. 252 HP / 0 Def Eternatus: 250-296 (51.6 - 61.1%) -- guaranteed 2HKO
27
Ribombee
BugFairy
SOFT CHECK
58.337
26.2%
checker faints 8.12%
▾
252+ SpA Ribombee Psychic Noise vs. 252 HP / 252+ SpD Eternatus: 110-130 (22.7 - 26.8%) -- 33.3% chance to 4HKO
28
Corviknight
FlyingSteel
SOFT CHECK
45.018
22.4%
checker faints 7.94%
▾
252+ Atk Corviknight Brave Bird vs. 252 HP / 0 Def Eternatus: 171-202 (35.3 - 41.7%) -- guaranteed 3HKO
29
Arceus-Poison
Poison
SOFT CHECK
20.719
18.1%
checker faints 8.46%
▾
0- Atk Toxic Plate Arceus-Poison Gunk Shot vs. 252 HP / 0 Def Eternatus: 84-100 (17.3 - 20.6%) -- possible 5HKO
30
Glimmora
RockPoison
SOFT CHECK
197.95
12.0%
checker faints 3.86%
▾
0- SpA Glimmora Power Gem vs. 252 HP / 252+ SpD Eternatus: 73-87 (15 - 17.9%) -- possible 6HKO
Ranked #28 with 5.27% usage. Sorted by reliability score.