Observed target KO or switch rate is upstream p: the fraction of relevant encounters where the target was knocked out or switched out. Standard error is upstream d. The conservative score is p − 4d. These ladder observations do not prove a set-specific counter.
How to read this table
Use encounter count and standard error to judge the sample. Damage estimates below use inferred sets and remain separate from the observed ladder metric.
#
Checker
Encounters
Conservative score
Target KO or switch rate
01
Swampert-Mega
WaterGround
OFFENSIVE CHECK
View matchup
119.495
91.6%
Standard error 2.54 points
▾
252+ Atk Swampert-Mega Earthquake vs. 252 HP / 0 Def Heatran: 760-900 (196.8 - 233.1%) -- guaranteed OHKO
02
Medicham-Mega
FightingPsychic
OFFENSIVE CHECK
View matchup
100.356
82.8%
Standard error 3.77 points
▾
252+ Atk Pure Power Medicham-Mega High Jump Kick vs. 252 HP / 0 Def Heatran: 738-870 (191.1 - 225.3%) -- guaranteed OHKO
03
Gliscor
GroundFlying
DEFENSIVE CHECK
View matchup
280.665
75.2%
Standard error 2.58 points
▾
252+ SpA Heatran Magma Storm vs. 252 HP / 252+ SpD Gliscor: 156-184 (44 - 51.9%) -- guaranteed 2HKO after trapping damage
04
Gastrodon
WaterGround
DEFENSIVE CHECK
View matchup
114.839
79.2%
Standard error 3.79 points
▾
252+ SpA Heatran Earth Power vs. 252 HP / 252+ SpD Gastrodon: 89-105 (20.8 - 24.6%) -- possible 6HKO
05
Greninja
WaterDark
OFFENSIVE CHECK
View matchup
259.989
72.1%
Standard error 2.78 points
▾
252+ SpA Choice Specs Greninja Hydro Pump vs. 252 HP / 252+ SpD Heatran: 348-410 (90.1 - 106.2%) -- 37.5% chance to OHKO
06
Garchomp
DragonGround
OFFENSIVE CHECK
View matchup
68.833
78.6%
Standard error 4.95 points
▾
252+ Atk Garchomp Earthquake vs. 252 HP / 0 Def Heatran: 684-808 (177.2 - 209.3%) -- guaranteed OHKO
07
Dragonite
DragonFlying
OFFENSIVE CHECK
View matchup
26.502
85.6%
Standard error 6.82 points
▾
252+ Atk Dragonite Earthquake vs. 252 HP / 0 Def Heatran: 468-552 (121.2 - 143%) -- guaranteed OHKO
08
Tapu Fini
WaterFairy
DEFENSIVE CHECK
View matchup
172.962
69.6%
Standard error 3.50 points
▾
252+ SpA Heatran Earth Power vs. 252 HP / 252+ SpD Tapu Fini: 65-77 (18.8 - 22.3%) -- possible 6HKO
09
Landorus-Therian
GroundFlying
OFFENSIVE CHECK
View matchup
302.191
63.6%
Standard error 2.77 points
▾
252+ Atk Landorus-Therian Earthquake vs. 252 HP / 0 Def Heatran: 744-876 (192.7 - 226.9%) -- guaranteed OHKO
10
Sableye-Mega
DarkGhost
DEFENSIVE CHECK
View matchup
63.424
71.0%
Standard error 5.70 points
▾
252+ SpA Heatran Magma Storm vs. 252 HP / 252+ SpD Sableye-Mega: 118-139 (38.8 - 45.7%) -- guaranteed 2HKO after trapping damage
11
Charizard-Mega-Y
FireFlying
OFFENSIVE CHECK
View matchup
58.044
71.0%
Standard error 5.95 points
▾
252+ SpA Charizard-Mega-Y Hidden Power Ground vs. 252 HP / 252+ SpD Heatran: 232-276 (60.1 - 71.5%) -- guaranteed 2HKO after Leftovers recovery
12
Excadrill
GroundSteel
OFFENSIVE CHECK
View matchup
55.845
69.2%
Standard error 6.18 points
▾
252+ Atk Excadrill Earthquake vs. 252 HP / 0 Def Heatran: 708-832 (183.4 - 215.5%) -- guaranteed OHKO
13
Alakazam-Mega
Psychic
OFFENSIVE CHECK
View matchup
20.148
77.9%
Standard error 9.25 points
▾
252+ SpA Alakazam-Mega Focus Blast vs. 252 HP / 252+ SpD Heatran: 248-294 (64.2 - 76.1%) -- guaranteed 2HKO after Leftovers recovery
14
Kyurem-Black
DragonIce
OFFENSIVE CHECK
View matchup
79.606
61.0%
Standard error 5.47 points
▾
0- SpA Teravolt Kyurem-Black Earth Power vs. 252 HP / 252+ SpD Heatran: 188-224 (48.7 - 58%) -- 50.8% chance to 2HKO after Leftovers recovery
15
Tyranitar-Mega
RockDark
DEFENSIVE CHECK
View matchup
23.822
70.8%
Standard error 9.32 points
▾
252+ SpA Heatran Earth Power vs. 252 HP / 252+ SpD Tyranitar-Mega in Sand: 92-110 (22.7 - 27.2%) -- 50% chance to 4HKO
16
Heatran
FireSteel
SOFT CHECK
View matchup
247.626
42.3%
Standard error 3.14 points
▾
252+ SpA Heatran Earth Power vs. 252 HP / 252+ SpD Heatran: 300-356 (77.7 - 92.2%) -- guaranteed 2HKO after Leftovers recovery
17
Kartana
GrassSteel
SOFT CHECK
View matchup
98.128
47.5%
Standard error 5.04 points
▾
252+ Atk Kartana Sacred Sword vs. 252 HP / 0 Def Heatran: 264-312 (68.3 - 80.8%) -- guaranteed 2HKO after Leftovers recovery
18
Diancie-Mega
RockFairy
OFFENSIVE CHECK
View matchup
20.987
68.0%
Standard error 10.18 points
▾
252+ SpA Diancie-Mega Earth Power vs. 252 HP / 252+ SpD Heatran: 348-412 (90.1 - 106.7%) -- 37.5% chance to OHKO
19
Rotom-Wash
ElectricWater
SOFT CHECK
View matchup
77.472
49.2%
Standard error 5.68 points
▾
252+ SpA Rotom-Wash Hydro Pump vs. 252 HP / 252+ SpD Heatran: 236-278 (61.1 - 72%) -- guaranteed 2HKO after Leftovers recovery
20
Latias-Mega
DragonPsychic
SOFT CHECK
View matchup
163.386
38.4%
Standard error 3.81 points
▾
252+ SpA Latias-Mega Thunder vs. 252 HP / 252+ SpD Heatran: 96-114 (24.8 - 29.5%) -- possible 5HKO
21
Chansey
Normal
SOFT CHECK
View matchup
112.481
40.7%
Standard error 4.63 points
▾
Chansey Seismic Toss vs. 252 HP Heatran: 100-100 (25.9 - 25.9%) -- guaranteed 5HKO after Leftovers recovery
22
Toxapex
PoisonWater
SOFT CHECK
View matchup
284.186
33.0%
Standard error 2.79 points
▾
252+ SpA Toxapex Scald vs. 252 HP / 252+ SpD Heatran: 116-138 (30 - 35.7%) -- guaranteed 4HKO after Leftovers recovery
23
Tapu Koko
ElectricFairy
SOFT CHECK
View matchup
211.971
31.1%
Standard error 3.18 points
▾
Tapu Koko Nature's Madness vs. 252 HP Heatran: 193-193 (50 - 50%) -- guaranteed 3HKO after Leftovers recovery
24
Clefable
Fairy
SOFT CHECK
View matchup
172.432
31.6%
Standard error 3.54 points
▾
252+ SpA Clefable Thunderbolt vs. 252 HP / 252+ SpD Heatran: 61-72 (15.8 - 18.6%) -- possible 8HKO
25
Serperior
Grass
SOFT CHECK
View matchup
57.2
41.7%
Standard error 6.52 points
▾
0- Atk Serperior Knock Off (97.5 BP) vs. 252 HP / 0 Def Heatran: 47-56 (12.1 - 14.5%) -- possible 7HKO
26
Magearna
SteelFairy
SOFT CHECK
View matchup
265.994
23.3%
Standard error 2.59 points
▾
252+ SpA Magearna Focus Blast vs. 252 HP / 252+ SpD Heatran: 200-236 (51.8 - 61.1%) -- 94.9% chance to 2HKO after Leftovers recovery
27
Tapu Lele
PsychicFairy
SOFT CHECK
View matchup
61.238
37.2%
Standard error 6.18 points
▾
252+ SpA Choice Specs Tapu Lele Focus Blast vs. 252 HP / 252+ SpD Heatran: 298-352 (77.2 - 91.1%) -- guaranteed 2HKO after Leftovers recovery
28
Tornadus-Therian
Flying
SOFT CHECK
View matchup
168.814
21.2%
Standard error 3.15 points
▾
252+ SpA Tornadus-Therian Focus Blast vs. 252 HP / 252+ SpD Heatran: 178-210 (46.1 - 54.4%) -- 4.7% chance to 2HKO after Leftovers recovery
29
Tangrowth
Grass
SOFT CHECK
View matchup
25.889
44.0%
Standard error 9.76 points
▾
252+ Atk Tangrowth Earthquake vs. 252 HP / 0 Def Heatran: 384-452 (99.4 - 117%) -- 93.8% chance to OHKO
30
Ditto
Normal
SOFT CHECK
View matchup
51.491
29.0%
Standard error 6.32 points
▾
Ditto vs. Heatran: 0-0 (0 - 0%)
Ranked #7 with 17.64% usage. Sorted by conservative score.