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
Gholdengo
SteelGhost
OFFENSIVE CHECK
267.167
90.2%
checker faints 3.10%
▾
252+ SpA Gholdengo Focus Blast vs. 252 HP / 252+ SpD Ferrothorn: 192-226 (54.5 - 64.2%) -- guaranteed 2HKO after Leftovers recovery
02
Ursaluna
GroundNormal
OFFENSIVE CHECK
32.71
89.0%
checker faints 5.47%
▾
252+ Atk Ursaluna Fire Punch vs. 252 HP / 0 Def Ferrothorn: 300-356 (85.2 - 101.1%) -- 12.5% chance to OHKO
03
Charizard-Mega-Y
FireFlying
OFFENSIVE CHECK
158.453
87.0%
checker faints 4.55%
▾
252+ SpA Charizard-Mega-Y Overheat vs. 252 HP / 252+ SpD Ferrothorn in Sun: 1056-1248 (300 - 354.5%) -- guaranteed OHKO
04
Heatran
FireSteel
OFFENSIVE CHECK
119.943
85.7%
checker faints 5.39%
▾
252+ SpA Heatran Eruption (150 BP) vs. 252 HP / 252+ SpD Ferrothorn: 700-828 (198.8 - 235.2%) -- guaranteed OHKO
05
Volcarona
BugFire
OFFENSIVE CHECK
67.081
84.1%
checker faints 6.17%
▾
252+ SpA Volcarona Flamethrower vs. 252 HP / 252+ SpD Ferrothorn: 436-516 (123.8 - 146.5%) -- guaranteed OHKO
06
Latios-Mega
DragonPsychic
OFFENSIVE CHECK
44.093
83.6%
checker faints 7.25%
▾
252+ SpA Latios-Mega Mystical Fire vs. 252 HP / 252+ SpD Ferrothorn: 272-324 (77.2 - 92%) -- guaranteed 2HKO after Leftovers recovery
07
Dragonite
DragonFlying
OFFENSIVE CHECK
100.995
73.0%
checker faints 7.50%
▾
252+ Atk Dragonite Fire Punch vs. 252 HP / 0 Def Ferrothorn: 292-348 (82.9 - 98.8%) -- guaranteed 2HKO after Leftovers recovery
08
Urshifu-Rapid-Strike
FightingWater
OFFENSIVE CHECK
67.619
71.4%
checker faints 7.74%
▾
252+ Atk Urshifu-Rapid-Strike Close Combat vs. 252 HP / 0 Def Ferrothorn: 342-404 (97.1 - 114.7%) -- 81.3% chance to OHKO
09
Tornadus-Therian
Flying
OFFENSIVE CHECK
167.547
71.1%
checker faints 5.95%
▾
252+ SpA Tornadus-Therian Heat Wave vs. 252 HP / 252+ SpD Ferrothorn: 264-312 (75 - 88.6%) -- guaranteed 2HKO after Leftovers recovery
10
Zamazenta
Fighting
OFFENSIVE CHECK
177.58
70.9%
checker faints 5.89%
▾
252+ Atk Zamazenta Close Combat vs. 252 HP / 0 Def Ferrothorn: 320-380 (90.9 - 107.9%) -- 50% chance to OHKO
11
Charizard-Mega-X
FireDragon
OFFENSIVE CHECK
111.773
69.8%
checker faints 7.09%
▾
252+ Atk Tough Claws Charizard-Mega-X Flare Blitz vs. 252 HP / 0 Def Ferrothorn: 888-1048 (252.2 - 297.7%) -- guaranteed OHKO
12
Kingambit
DarkSteel
DEFENSIVE COUNTER
140.935
69.2%
checker faints 6.65%
▾
0 Def Ferrothorn Body Press vs. 252 HP / 252+ Def Kingambit: 184-220 (45.5 - 54.4%) -- 52.3% chance to 2HKO
13
Cinderace
Fire
OFFENSIVE CHECK
52.531
68.4%
checker faints 8.90%
▾
252+ Atk Cinderace Pyro Ball vs. 252 HP / 0 Def Ferrothorn: 636-748 (180.6 - 212.5%) -- guaranteed OHKO
14
Terapagos
Normal
DEFENSIVE COUNTER
165.053
67.8%
checker faints 6.26%
▾
252+ Atk Ferrothorn Power Whip vs. 252 HP / 252+ Def Terapagos: 138-163 (35.9 - 42.4%) -- guaranteed 3HKO
15
Iron Valiant
FairyFighting
OFFENSIVE CHECK
101.039
65.5%
checker faints 8.14%
▾
252+ Atk Iron Valiant Close Combat vs. 252 HP / 0 Def Ferrothorn: 342-404 (97.1 - 114.7%) -- 81.3% chance to OHKO
16
Moltres
FireFlying
OFFENSIVE CHECK
111.442
65.4%
checker faints 7.80%
▾
252+ SpA Moltres Flamethrower vs. 252 HP / 252+ SpD Ferrothorn: 408-484 (115.9 - 137.5%) -- guaranteed OHKO
17
Kyurem
DragonIce
OFFENSIVE CHECK
152.703
62.8%
checker faints 6.70%
▾
252+ SpA Kyurem Ice Beam vs. 252 HP / 252+ SpD Ferrothorn: 105-124 (29.8 - 35.2%) -- guaranteed 4HKO after Leftovers recovery
18
Hatterene
PsychicFairy
OFFENSIVE CHECK
106.05
62.5%
checker faints 8.02%
▾
252+ SpA Hatterene Mystical Fire vs. 252 HP / 252+ SpD Ferrothorn: 244-288 (69.3 - 81.8%) -- guaranteed 2HKO after Leftovers recovery
19
Zapdos
ElectricFlying
OFFENSIVE CHECK
191.966
58.6%
checker faints 6.14%
▾
252+ SpA Zapdos Heat Wave vs. 252 HP / 252+ SpD Ferrothorn: 288-340 (81.8 - 96.5%) -- guaranteed 2HKO after Leftovers recovery
20
Keldeo
WaterFighting
SOFT CHECK
21.923
54.8%
checker faints 10.63%
▾
252+ SpA Keldeo Secret Sword vs. 252 HP / 0 Def Ferrothorn: 240-284 (68.1 - 80.6%) -- guaranteed 2HKO after Leftovers recovery
21
Garchomp
DragonGround
SOFT CHECK
88.159
54.7%
checker faints 7.44%
▾
252+ Atk Garchomp Fire Fang vs. 252 HP / 0 Def Ferrothorn: 248-296 (70.4 - 84%) -- guaranteed 2HKO after Leftovers recovery
22
Great Tusk
GroundFighting
SOFT CHECK
146.078
50.3%
checker faints 7.09%
▾
252+ Atk Great Tusk Close Combat vs. 252 HP / 0 Def Ferrothorn: 344-408 (97.7 - 115.9%) -- 87.5% chance to OHKO
23
Melmetal
Steel
SOFT CHECK
154.835
50.1%
checker faints 6.95%
▾
252+ Atk Melmetal Superpower vs. 252 HP / 0 Def Ferrothorn: 246-290 (69.8 - 82.3%) -- guaranteed 2HKO after Leftovers recovery
24
Diancie-Mega
RockFairy
SOFT CHECK
65.052
49.8%
checker faints 8.51%
▾
252+ SpA Diancie-Mega Mystical Fire vs. 252 HP / 252+ SpD Ferrothorn: 272-324 (77.2 - 92%) -- guaranteed 2HKO after Leftovers recovery
25
Scizor-Mega
BugSteel
SOFT CHECK
48.584
48.9%
checker faints 9.60%
▾
252+ Atk Scizor-Mega Close Combat vs. 252 HP / 0 Def Ferrothorn: 254-300 (72.1 - 85.2%) -- guaranteed 2HKO after Leftovers recovery
26
Landorus-Therian
GroundFlying
SOFT CHECK
174.387
48.7%
checker faints 6.49%
▾
252+ Atk Landorus-Therian Earthquake vs. 252 HP / 0 Def Ferrothorn: 154-183 (43.7 - 51.9%) -- guaranteed 3HKO after Leftovers recovery
27
Ogerpon-Wellspring
GrassWater
SOFT CHECK
195.921
48.3%
checker faints 6.05%
▾
252+ Atk Wellspring Mask Ogerpon-Wellspring Superpower vs. 252 HP / 0 Def Ferrothorn: 258-304 (73.2 - 86.3%) -- guaranteed 2HKO after Leftovers recovery
28
Venusaur-Mega
GrassPoison
SOFT CHECK
116.348
48.2%
checker faints 7.88%
▾
252+ SpA Venusaur-Mega Hidden Power Fire vs. 252 HP / 252+ SpD Ferrothorn: 180-216 (51.1 - 61.3%) -- 92.6% chance to 2HKO after Leftovers recovery
29
Ferrothorn
GrassSteel
SOFT CHECK
106.261
46.2%
checker faints 8.25%
▾
0 Def Ferrothorn Body Press vs. 252 HP / 0 Def Ferrothorn: 116-138 (32.9 - 39.2%) -- 9.6% chance to 3HKO after Leftovers recovery
30
Tapu Lele
PsychicFairy
SOFT CHECK
127.451
45.9%
checker faints 7.53%
▾
252+ SpA Tapu Lele Hidden Power Fire vs. 252 HP / 252+ SpD Ferrothorn: 188-224 (53.4 - 63.6%) -- guaranteed 2HKO after Leftovers recovery
Ranked #29 with 7.46% usage. Sorted by reliability score.