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
Chesnaught
GrassFighting
DEFENSIVE COUNTER
20.42
88.0%
checker faints 7.20%
▾
252+ Atk Wellspring Mask Ogerpon-Wellspring Play Rough vs. 252 HP / 252+ Def Chesnaught: 154-182 (40.5 - 47.8%) -- guaranteed 3HKO
02
Venusaur-Mega
GrassPoison
DEFENSIVE COUNTER
245.958
85.9%
checker faints 3.71%
▾
252+ Atk Wellspring Mask Ogerpon-Wellspring Ivy Cudgel vs. 252 HP / 252+ Def Venusaur-Mega: 63-75 (17.3 - 20.6%) -- possible 5HKO
03
Dragonite
DragonFlying
OFFENSIVE CHECK
302.133
81.6%
checker faints 3.72%
▾
252+ Atk Dragonite Fly vs. 252 HP / 0 Def Ogerpon-Wellspring: 384-452 (105.4 - 124.1%) -- guaranteed OHKO
04
Tangrowth
Grass
DEFENSIVE COUNTER
28.057
81.5%
checker faints 7.34%
▾
252+ Atk Wellspring Mask Ogerpon-Wellspring U-turn vs. 252 HP / 252+ Def Tangrowth: 118-140 (29.2 - 34.6%) -- 6.9% chance to 3HKO
05
Serperior
Grass
DEFENSIVE COUNTER
32.793
81.2%
checker faints 6.83%
▾
252+ Atk Wellspring Mask Ogerpon-Wellspring U-turn vs. 252 HP / 252+ Def Serperior: 142-168 (40.1 - 47.4%) -- guaranteed 3HKO after Leftovers recovery
06
Sinistcha
GrassGhost
OFFENSIVE CHECK
23.287
78.9%
checker faints 8.45%
07
Zamazenta
Fighting
OFFENSIVE CHECK
509.631
78.6%
checker faints 3.06%
▾
252+ Atk Zamazenta Close Combat vs. 252 HP / 0 Def Ogerpon-Wellspring: 235-277 (64.5 - 76%) -- guaranteed 2HKO
08
Kartana
GrassSteel
OFFENSIVE CHECK
27.572
77.7%
checker faints 7.93%
▾
252+ Atk Kartana Giga Impact vs. 252 HP / 0 Def Ogerpon-Wellspring: 267-315 (73.3 - 86.5%) -- guaranteed 2HKO
09
Gengar
GhostPoison
OFFENSIVE CHECK
70.513
75.3%
checker faints 8.61%
▾
252+ SpA Gengar Sludge Wave vs. 252 HP / 252+ SpD Ogerpon-Wellspring: 254-300 (69.7 - 82.4%) -- guaranteed 2HKO
10
Latios-Mega
DragonPsychic
OFFENSIVE CHECK
53.204
73.3%
checker faints 6.07%
▾
252+ SpA Latios-Mega Draco Meteor vs. 252 HP / 252+ SpD Ogerpon-Wellspring: 201-237 (55.2 - 65.1%) -- guaranteed 2HKO
11
Tapu Bulu
GrassFairy
OFFENSIVE CHECK
31.65
72.3%
checker faints 7.95%
12
Mawile-Mega
SteelFairy
DEFENSIVE COUNTER
31.557
70.2%
checker faints 8.14%
▾
252+ Atk Wellspring Mask Ogerpon-Wellspring Ivy Cudgel vs. 252 HP / 252+ Def Mawile-Mega: 126-148 (41.4 - 48.6%) -- guaranteed 3HKO
13
Iron Valiant
FairyFighting
OFFENSIVE CHECK
162.432
69.7%
checker faints 6.19%
▾
252+ Atk Iron Valiant Close Combat vs. 252 HP / 0 Def Ogerpon-Wellspring: 249-294 (68.4 - 80.7%) -- guaranteed 2HKO
14
Lopunny-Mega
NormalFighting
OFFENSIVE CHECK
116.514
69.4%
checker faints 7.25%
▾
252+ Atk Lopunny-Mega Close Combat vs. 252 HP / 0 Def Ogerpon-Wellspring: 258-304 (70.8 - 83.5%) -- guaranteed 2HKO
15
Kyurem
DragonIce
OFFENSIVE CHECK
230.67
66.9%
checker faints 5.04%
▾
252+ SpA Kyurem Freeze-Dry vs. 252 HP / 252+ SpD Ogerpon-Wellspring: 372-444 (102.1 - 121.9%) -- guaranteed OHKO
16
Hydrapple
GrassDragon
DEFENSIVE COUNTER
34.167
66.4%
checker faints 8.08%
▾
252+ Atk Wellspring Mask Ogerpon-Wellspring Play Rough vs. 252 HP / 252+ Def Hydrapple: 166-196 (39.9 - 47.1%) -- guaranteed 3HKO
17
Charizard-Mega-X
FireDragon
OFFENSIVE CHECK
91.745
64.2%
checker faints 8.54%
▾
252+ Atk Tough Claws Charizard-Mega-X Flare Blitz vs. 252 HP / 0 Def Ogerpon-Wellspring: 324-382 (89 - 104.9%) -- 31.3% chance to OHKO
18
Ogerpon-Cornerstone
GrassRock
OFFENSIVE CHECK
21.443
63.2%
checker faints 10.41%
▾
252+ Atk Cornerstone Mask Ogerpon-Cornerstone Power Whip vs. 252 HP / 0 Def Ogerpon-Wellspring: 282-333 (77.4 - 91.4%) -- guaranteed 2HKO
19
Raging Bolt
ElectricDragon
OFFENSIVE CHECK
349.906
62.7%
checker faints 4.35%
▾
252+ SpA Choice Specs Raging Bolt Draco Meteor vs. 252 HP / 252+ SpD Ogerpon-Wellspring: 268-316 (73.6 - 86.8%) -- guaranteed 2HKO
20
Pecharunt
PoisonGhost
DEFENSIVE COUNTER
164.893
59.0%
checker faints 6.30%
▾
252+ Atk Wellspring Mask Ogerpon-Wellspring Ivy Cudgel vs. 252 HP / 252+ Def Pecharunt: 105-124 (27.6 - 32.6%) -- guaranteed 4HKO
21
Altaria-Mega
DragonFairy
DEFENSIVE COUNTER
20.445
58.7%
checker faints 10.89%
▾
252+ Atk Wellspring Mask Ogerpon-Wellspring Play Rough vs. 252 HP / 252+ Def Altaria-Mega: 166-196 (46.8 - 55.3%) -- 74.2% chance to 2HKO
22
Melmetal
Steel
DEFENSIVE COUNTER
228.687
57.0%
checker faints 5.56%
▾
252+ Atk Wellspring Mask Ogerpon-Wellspring Superpower vs. 252 HP / 252+ Def Melmetal: 182-216 (38.3 - 45.5%) -- guaranteed 3HKO
23
Tornadus-Therian
Flying
OFFENSIVE CHECK
285.699
56.5%
checker faints 4.89%
▾
252+ SpA Tornadus-Therian Hurricane vs. 252 HP / 252+ SpD Ogerpon-Wellspring: 260-308 (71.4 - 84.6%) -- guaranteed 2HKO
24
Ceruledge
FireGhost
OFFENSIVE CHECK
37.398
55.4%
checker faints 8.13%
▾
252+ Atk Ceruledge Poltergeist vs. 252 HP / 0 Def Ogerpon-Wellspring: 222-262 (60.9 - 71.9%) -- guaranteed 2HKO
25
Kingambit
DarkSteel
SOFT CHECK
273.41
54.2%
checker faints 4.97%
▾
252+ Atk Black Glasses Kingambit Kowtow Cleave vs. 252 HP / 0 Def Ogerpon-Wellspring: 219-258 (60.1 - 70.8%) -- guaranteed 2HKO
26
Archaludon
SteelDragon
SOFT CHECK
25.559
51.9%
checker faints 9.88%
▾
252+ SpA Archaludon Draco Meteor vs. 252 HP / 252+ SpD Ogerpon-Wellspring: 168-198 (46.1 - 54.3%) -- 53.1% chance to 2HKO
27
Greninja
WaterDark
SOFT CHECK
27.214
51.2%
checker faints 9.58%
▾
252+ SpA Life Orb Greninja Sludge Wave vs. 252 HP / 252+ SpD Ogerpon-Wellspring: 187-221 (51.3 - 60.7%) -- guaranteed 2HKO
28
Terapagos
Normal
SOFT CHECK
267.677
51.2%
checker faints 5.16%
▾
252+ Atk Terapagos Rapid Spin vs. 252 HP / 0 Def Ogerpon-Wellspring: 67-79 (18.4 - 21.7%) -- possible 5HKO
29
Skarmory
SteelFlying
SOFT CHECK
62.279
49.8%
checker faints 8.76%
▾
0 Def Skarmory Body Press vs. 252 HP / 0 Def Ogerpon-Wellspring: 90-106 (24.7 - 29.1%) -- 99.9% chance to 4HKO
30
Scizor-Mega
BugSteel
SOFT CHECK
174.807
49.4%
checker faints 6.40%
▾
252+ Atk Scizor-Mega U-turn vs. 252 HP / 0 Def Ogerpon-Wellspring: 324-384 (89 - 105.4%) -- 31.3% chance to OHKO
Ranked #10 with 13.41% usage. Sorted by reliability score.