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
Skarmory
SteelFlying
DEFENSIVE COUNTER
24.825
91.7%
checker faints 5.54%
▾
0- SpA Iron Treads Volt Switch vs. 252 HP / 0 SpD Skarmory: 94-112 (28.1 - 33.5%) -- 0.1% chance to 3HKO
02
Arceus-Water
Water
DEFENSIVE COUNTER
30.019
90.7%
checker faints 5.31%
▾
252+ Atk Iron Treads Earthquake vs. 252 HP / 252+ Def Arceus-Water: 103-123 (23.1 - 27.7%) -- 73.7% chance to 4HKO
03
Dondozo
Water
DEFENSIVE COUNTER
58.994
90.5%
checker faints 5.09%
▾
252+ Atk Iron Treads Earthquake vs. 252 HP / 252+ Def Dondozo: 106-126 (21 - 25%) -- possible 5HKO
04
Arceus-Ground
Ground
DEFENSIVE COUNTER
416.576
88.5%
checker faints 2.70%
▾
252+ Atk Iron Treads Ice Spinner vs. 252 HP / 252+ Def Arceus-Ground: 112-132 (25.2 - 29.7%) -- guaranteed 4HKO
05
Calyrex-Ice
PsychicIce
DEFENSIVE COUNTER
127.235
85.1%
checker faints 5.15%
▾
252+ Atk Iron Treads Iron Head vs. 252 HP / 252+ Def Calyrex-Ice: 140-168 (34.6 - 41.5%) -- guaranteed 3HKO
06
Kyurem-Black
DragonIce
OFFENSIVE CHECK
22.881
83.1%
checker faints 7.84%
▾
252+ Atk Kyurem-Black Icicle Spear (3 hits) vs. 252 HP / 0 Def Iron Treads: 144-171 (37.5 - 44.5%) -- guaranteed 3HKO after Leftovers recovery
07
Corviknight
FlyingSteel
DEFENSIVE COUNTER
262.612
82.8%
checker faints 3.76%
▾
0- SpA Iron Treads Volt Switch vs. 252 HP / 0 SpD Corviknight: 80-96 (20 - 24%) -- possible 6HKO
08
Kyogre
Water
DEFENSIVE COUNTER
165.736
80.9%
checker faints 5.23%
▾
252+ Atk Iron Treads Earthquake vs. 252 HP / 252+ Def Kyogre: 126-148 (31.1 - 36.6%) -- 72.5% chance to 3HKO
09
Koraidon
FightingDragon
OFFENSIVE CHECK
797.718
79.9%
checker faints 2.42%
▾
252+ Atk Orichalcum Pulse Koraidon Collision Course (133.3251953125 BP) vs. 252 HP / 0 Def Iron Treads: 560-660 (145.8 - 171.8%) -- guaranteed OHKO
10
Chien-Pao
DarkIce
OFFENSIVE CHECK
45.124
78.9%
checker faints 8.57%
▾
252+ Atk Sword of Ruin Chien-Pao Sacred Sword vs. 252 HP / 0 Def Iron Treads: 232-274 (60.4 - 71.3%) -- guaranteed 2HKO after Leftovers recovery
11
Ting-Lu
DarkGround
DEFENSIVE COUNTER
272.04
77.5%
checker faints 4.35%
▾
252+ Atk Iron Treads Ice Spinner vs. 252 HP / 252+ Def Ting-Lu: 108-128 (21 - 24.9%) -- possible 6HKO
12
Giratina-Origin
GhostDragon
DEFENSIVE COUNTER
24.536
75.6%
checker faints 8.67%
▾
252+ Atk Iron Treads Ice Spinner vs. 252 HP / 252+ Def Giratina-Origin: 124-148 (24.6 - 29.3%) -- 99.9% chance to 4HKO
13
Necrozma-Dusk-Mane
PsychicSteel
OFFENSIVE CHECK
20.736
71.6%
checker faints 9.90%
▾
252+ Atk Necrozma-Dusk-Mane Earthquake vs. 252 HP / 0 Def Iron Treads: 238-280 (61.9 - 72.9%) -- guaranteed 2HKO after Leftovers recovery
14
Arceus
Normal
DEFENSIVE COUNTER
426.516
69.3%
checker faints 3.78%
▾
252+ Atk Iron Treads Earthquake vs. 252 HP / 252+ Def Arceus: 103-123 (23.1 - 27.7%) -- 73.7% chance to 4HKO
15
Terapagos
Normal
DEFENSIVE COUNTER
22.598
68.7%
checker faints 9.76%
▾
252+ Atk Iron Treads Earthquake vs. 252 HP / 252+ Def Terapagos: 130-154 (33.8 - 40.1%) -- guaranteed 3HKO
16
Zacian-Crowned
FairySteel
OFFENSIVE CHECK
188.4
63.6%
checker faints 5.98%
▾
+1 252+ Atk Zacian-Crowned Close Combat vs. 252 HP / 0 Def Iron Treads: 408-482 (106.2 - 125.5%) -- guaranteed OHKO
17
Ho-Oh
FireFlying
DEFENSIVE COUNTER
658.237
62.5%
checker faints 3.24%
▾
252+ Atk Iron Treads Knock Off (97.5 BP) vs. 252 HP / 252+ Def Ho-Oh: 81-96 (19.4 - 23%) -- possible 5HKO
18
Grafaiai
PoisonNormal
OFFENSIVE CHECK
24.792
62.4%
checker faints 9.73%
▾
252+ Atk Grafaiai Low Kick (120 BP) vs. 252 HP / 0 Def Iron Treads: 198-234 (51.5 - 60.9%) -- 93.4% chance to 2HKO after Leftovers recovery
19
Arceus-Fairy
Fairy
DEFENSIVE COUNTER
154.569
62.0%
checker faints 6.62%
▾
252+ Atk Iron Treads Iron Head vs. 252 HP / 252+ Def Arceus-Fairy: 168-198 (37.8 - 44.5%) -- guaranteed 3HKO
20
Gliscor
GroundFlying
DEFENSIVE COUNTER
363.498
61.6%
checker faints 4.40%
▾
252+ Atk Iron Treads Ice Spinner vs. 252 HP / 252+ Def Gliscor: 216-256 (61 - 72.3%) -- guaranteed 2HKO
21
Calyrex-Shadow
PsychicGhost
OFFENSIVE CHECK
1,064.124
60.0%
checker faints 2.57%
▾
252+ SpA Calyrex-Shadow Astral Barrage vs. 252 HP / 252+ SpD Iron Treads: 232-274 (60.4 - 71.3%) -- guaranteed 2HKO after Leftovers recovery
22
Skeledirge
FireGhost
DEFENSIVE COUNTER
163.056
60.0%
checker faints 6.45%
▾
252+ Atk Iron Treads Earthquake vs. 252 HP / 252+ Def Skeledirge: 234-276 (56.7 - 66.9%) -- guaranteed 2HKO
23
Kingambit
DarkSteel
DEFENSIVE COUNTER
51.556
56.8%
checker faints 9.73%
▾
252+ Atk Iron Treads Earthquake vs. 252 HP / 252+ Def Kingambit: 206-246 (50.9 - 60.8%) -- guaranteed 2HKO
24
Drifblim
GhostFlying
SOFT CHECK
23.261
51.2%
checker faints 10.36%
▾
252+ SpA Drifblim Shadow Ball vs. 252 HP / 252+ SpD Iron Treads: 102-120 (26.5 - 31.2%) -- 10.1% chance to 4HKO after Leftovers recovery
25
Iron Treads
GroundSteel
SOFT CHECK
260.919
48.6%
checker faints 5.30%
▾
252+ Atk Iron Treads Earthquake vs. 252 HP / 0 Def Iron Treads: 278-330 (72.3 - 85.9%) -- guaranteed 2HKO after Leftovers recovery
26
Smeargle
Normal
SOFT CHECK
398.871
48.5%
checker faints 4.14%
▾
27
243.707
42.9%
checker faints 5.36%
▾
Ditto vs. Iron Treads: 0-0 (0 - 0%)
28
Lapras
WaterIce
SOFT CHECK
32.768
42.3%
checker faints 8.63%
▾
252+ SpA Lapras Whirlpool vs. 252 HP / 252+ SpD Iron Treads: 86-104 (22.3 - 27%) -- 0.1% chance to 3HKO after Leftovers recovery and trapping damage
29
Eternatus
PoisonDragon
SOFT CHECK
157.566
42.0%
checker faints 6.46%
▾
252+ SpA Eternatus Flamethrower vs. 252 HP / 252+ SpD Iron Treads: 212-250 (55.2 - 65.1%) -- guaranteed 2HKO after Leftovers recovery
30
Flutter Mane
GhostFairy
SOFT CHECK
185.478
40.4%
checker faints 6.01%
▾
252+ SpA Flutter Mane Mystical Fire vs. 252 HP / 252+ SpD Iron Treads: 168-198 (43.7 - 51.5%) -- guaranteed 3HKO after Leftovers recovery
Ranked #13 with 11.71% usage. Sorted by reliability score.