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
Dragonite
DragonFlying
OFFENSIVE CHECK
131.481
90.8%
checker faints 4.26%
▾
252+ Atk Dragonite Earthquake vs. 252 HP / 0 Def Heatran: 468-552 (121.2 - 143%) -- guaranteed OHKO
02
Garchomp
DragonGround
OFFENSIVE CHECK
177.737
81.4%
checker faints 4.96%
▾
252+ Atk Garchomp Earthquake vs. 252 HP / 0 Def Heatran: 684-808 (177.2 - 209.3%) -- guaranteed OHKO
03
Ogerpon-Wellspring
GrassWater
OFFENSIVE CHECK
140.097
80.5%
checker faints 5.69%
▾
252+ Atk Wellspring Mask Ogerpon-Wellspring Ivy Cudgel vs. 252 HP / 0 Def Heatran: 390-458 (101 - 118.6%) -- guaranteed OHKO
04
Ting-Lu
DarkGround
DEFENSIVE COUNTER
141.475
80.4%
checker faints 5.55%
▾
252+ SpA Heatran Eruption (150 BP) vs. 252 HP / 252+ SpD Vessel of Ruin Ting-Lu: 168-198 (32.6 - 38.5%) -- 2.7% chance to 3HKO after Leftovers recovery
05
Zamazenta
Fighting
OFFENSIVE CHECK
175.814
76.3%
checker faints 5.48%
▾
252+ Atk Zamazenta Close Combat vs. 252 HP / 0 Def Heatran: 390-458 (101 - 118.6%) -- guaranteed OHKO
06
Samurott-Hisui
WaterDark
OFFENSIVE CHECK
57.199
75.7%
checker faints 8.00%
▾
252+ Atk Sharpness Samurott-Hisui Razor Shell vs. 252 HP / 0 Def Heatran: 338-398 (87.5 - 103.1%) -- 25% chance to OHKO
07
Tyranitar-Mega
RockDark
DEFENSIVE COUNTER
95.572
75.5%
checker faints 7.51%
▾
252+ SpA Heatran Flash Cannon vs. 252 HP / 252+ SpD Tyranitar-Mega in Sand: 122-146 (30.1 - 36.1%) -- 52.4% chance to 3HKO
08
Great Tusk
GroundFighting
DEFENSIVE COUNTER
177.312
73.8%
checker faints 5.60%
▾
252+ SpA Heatran Eruption (150 BP) vs. 252 HP / 252+ SpD Great Tusk: 282-333 (64.9 - 76.7%) -- guaranteed 2HKO
09
Clodsire
PoisonGround
DEFENSIVE COUNTER
73.014
73.6%
checker faints 6.92%
▾
252+ SpA Heatran Eruption (150 BP) vs. 252 HP / 252+ SpD Clodsire: 195-229 (42 - 49.3%) -- guaranteed 3HKO after Black Sludge recovery
10
Venusaur-Mega
GrassPoison
DEFENSIVE COUNTER
78.811
72.4%
checker faints 6.89%
▾
252+ SpA Heatran Eruption (150 BP) vs. 252 HP / 252+ SpD Thick Fat Venusaur-Mega: 170-204 (46.7 - 56%) -- 75.4% chance to 2HKO
11
Charizard-Mega-Y
FireFlying
OFFENSIVE CHECK
122.729
72.2%
checker faints 6.87%
▾
252+ SpA Charizard-Mega-Y Scorching Sands vs. 252 HP / 252+ SpD Heatran: 272-320 (70.4 - 82.9%) -- guaranteed 2HKO after Leftovers recovery
12
Ursaluna
GroundNormal
OFFENSIVE CHECK
89.303
71.4%
checker faints 8.23%
▾
252+ Atk Ursaluna Headlong Rush vs. 252 HP / 0 Def Heatran: 868-1024 (224.8 - 265.2%) -- guaranteed OHKO
13
Iron Treads
GroundSteel
DEFENSIVE COUNTER
98.325
71.0%
checker faints 7.89%
▾
252+ SpA Heatran Eruption (150 BP) vs. 252 HP / 252+ SpD Iron Treads: 486-572 (126.5 - 148.9%) -- guaranteed OHKO
14
Gliscor
GroundFlying
DEFENSIVE COUNTER
311.752
68.1%
checker faints 4.57%
▾
252+ SpA Heatran Eruption (150 BP) vs. 252 HP / 252+ SpD Gliscor: 232-274 (65.5 - 77.4%) -- guaranteed 2HKO
15
Urshifu-Rapid-Strike
FightingWater
OFFENSIVE CHECK
92.616
67.3%
checker faints 6.86%
▾
252+ Atk Urshifu-Rapid-Strike Close Combat vs. 252 HP / 0 Def Heatran: 410-486 (106.2 - 125.9%) -- guaranteed OHKO
16
Iron Valiant
FairyFighting
OFFENSIVE CHECK
77.929
65.8%
checker faints 9.28%
▾
252+ Atk Iron Valiant Close Combat vs. 252 HP / 0 Def Heatran: 410-486 (106.2 - 125.9%) -- guaranteed OHKO
17
Diancie-Mega
RockFairy
OFFENSIVE CHECK
97.03
63.1%
checker faints 8.41%
▾
252+ SpA Diancie-Mega Earth Power vs. 252 HP / 252+ SpD Heatran: 348-412 (90.1 - 106.7%) -- 37.5% chance to OHKO
18
Kyurem
DragonIce
OFFENSIVE CHECK
134.541
61.1%
checker faints 6.99%
▾
252+ SpA Kyurem Earth Power vs. 252 HP / 252+ SpD Heatran: 300-356 (77.7 - 92.2%) -- guaranteed 2HKO after Leftovers recovery
19
Terapagos
Normal
DEFENSIVE COUNTER
160.391
60.5%
checker faints 6.63%
▾
252+ SpA Heatran Eruption (150 BP) vs. 252 HP / 252+ SpD Terapagos: 216-255 (56.2 - 66.4%) -- guaranteed 2HKO
20
Landorus-Therian
GroundFlying
OFFENSIVE CHECK
183.264
59.8%
checker faints 6.17%
▾
252+ Atk Landorus-Therian Earthquake vs. 252 HP / 0 Def Heatran: 744-876 (192.7 - 226.9%) -- guaranteed OHKO
21
Latios-Mega
DragonPsychic
OFFENSIVE CHECK
70.663
57.8%
checker faints 8.10%
▾
252+ SpA Latios-Mega Aura Sphere vs. 252 HP / 252+ SpD Heatran: 156-184 (40.4 - 47.6%) -- guaranteed 3HKO after Leftovers recovery
22
Chansey
Normal
SOFT CHECK
52.395
54.4%
checker faints 9.63%
▾
Chansey Seismic Toss vs. 252 HP Heatran: 100-100 (25.9 - 25.9%) -- guaranteed 5HKO after Leftovers recovery
23
Heatran
FireSteel
SOFT CHECK
51.159
49.5%
checker faints 9.87%
▾
252+ SpA Heatran Earth Power vs. 252 HP / 252+ SpD Heatran: 300-356 (77.7 - 92.2%) -- guaranteed 2HKO after Leftovers recovery
24
Charizard-Mega-X
FireDragon
SOFT CHECK
83.517
49.2%
checker faints 9.32%
▾
252+ Atk Charizard-Mega-X Earthquake vs. 252 HP / 0 Def Heatran: 456-540 (118.1 - 139.8%) -- guaranteed OHKO
25
Clefable
Fairy
SOFT CHECK
83.698
47.5%
checker faints 6.91%
▾
0- Atk Clefable Knock Off (97.5 BP) vs. 252 HP / 0 Def Heatran: 45-53 (11.6 - 13.7%) -- possible 8HKO
26
Volcarona
BugFire
SOFT CHECK
79.528
42.1%
checker faints 7.76%
▾
252+ SpA Volcarona Hidden Power Ground vs. 252 HP / 252+ SpD Heatran: 204-244 (52.8 - 63.2%) -- 99.6% chance to 2HKO after Leftovers recovery
27
Raging Bolt
ElectricDragon
SOFT CHECK
154.043
38.9%
checker faints 6.80%
▾
252+ SpA Choice Specs Raging Bolt Thunderbolt vs. 252 HP / 252+ SpD Heatran: 174-205 (45 - 53.1%) -- 0.4% chance to 2HKO after Leftovers recovery
28
Kingambit
DarkSteel
SOFT CHECK
156.088
33.4%
checker faints 6.42%
▾
252+ Atk Kingambit Low Kick (120 BP) vs. 252 HP / 0 Def Heatran: 282-332 (73 - 86%) -- guaranteed 2HKO after Leftovers recovery
29
Tapu Lele
PsychicFairy
SOFT CHECK
125.791
33.2%
checker faints 7.25%
▾
252+ SpA Tapu Lele Focus Blast vs. 252 HP / 252+ SpD Heatran: 200-236 (51.8 - 61.1%) -- 94.9% chance to 2HKO after Leftovers recovery
30
Toxapex
PoisonWater
SOFT CHECK
157.342
33.0%
checker faints 6.38%
▾
252+ SpA Toxapex Scald vs. 252 HP / 252+ SpD Heatran: 116-138 (30 - 35.7%) -- guaranteed 4HKO after Leftovers recovery
Ranked #32 with 7.02% usage. Sorted by reliability score.