Is Diancie-Mega viable in Gen 7 OU?

Diancie-Mega is ranked #28 in Gen 7 OU with 7.00% usage according to Smogon May 2026 - Jul 2026 data.

What beats Diancie-Mega in Gen 7 OU?

Serperior has the strongest conservative score in this observed May 2026 - Jul 2026 sample. The target was knocked out or switched out in 89.9% of 29.78419252420036 relevant encounters. Standard error is 5.5 points. Sets and switch conditions can change the result.

How are Diancie-Mega matchup checks ranked in Gen 7 OU?

They are ranked by p minus four standard errors. Here, p is the observed fraction of relevant encounters where Diancie-Mega was knocked out or switched out. This is not a set-specific battle guarantee.

Diancie-Mega counters

Gen 7 OU · Sorted by p − 4 standard errors · Smogon source period May 2026 - Jul 2026 · Generated 2026-08-05

#0719 Diancie-Mega

RockFairy

USAGE 7.0% #28

BASE STATS

HP 50

ATK 160

DEF 110

SPA 160

SPD 110

SPE 110

BST700

TYPE MATCHUPS

4×

Steel

2×

WaterGrassGround

½×

NormalFireFlyingBugDark

0×

Dragon

Moves

Moonblast 76.9% Stealth Rock 73.2% Diamond Storm 55.3% Earth Power 53.1% Endeavor 39.1% Substitute 38.2% Protect 23.6% Hidden Power Fire 17.2%

Items

Diancite 100.0%

Common Teammates

Landorus-Therian59.1%

Leading observed checks

Open a matchup for a separate set-based damage estimate, or browse uploaded teams with both Pokémon.

Team core to explore

Diancie-Mega + Landorus-Therian 59.1% teammate usage Explore teams →

Checks & Counters

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

Serperior

Grass DEFENSIVE CHECK View matchup

29.784

67.9

89.9% Standard error 5.51 points

DAMAGE CALC

0- Atk Diancie-Mega Diamond Storm vs. 252 HP / 0 Def Serperior: 153-180 (43.2 - 50.8%) -- guaranteed 3HKO after Leftovers recovery

View Serperior counters → Teams with Serperior →

Jirachi

SteelPsychic DEFENSIVE CHECK View matchup

23.943

61.1

87.8% Standard error 6.68 points

DAMAGE CALC

252+ SpA Diancie-Mega Earth Power vs. 252 HP / 252+ SpD Jirachi: 182-216 (45 - 53.4%) -- 0.4% chance to 2HKO after Leftovers recovery

View Jirachi counters → Teams with Jirachi →

Greninja

WaterDark OFFENSIVE CHECK View matchup

120.632

51.2

77.3% Standard error 6.51 points

DAMAGE CALC

252+ SpA Choice Specs Greninja Hydro Pump vs. 252 HP / 252+ SpD Diancie-Mega: 338-402 (111.1 - 132.2%) -- guaranteed OHKO

View Greninja counters → Teams with Greninja →

Ferrothorn

GrassSteel DEFENSIVE CHECK View matchup

84.094

44.7

76.5% Standard error 7.95 points

DAMAGE CALC

252+ SpA Diancie-Mega Hidden Power Fire vs. 252 HP / 252+ SpD Ferrothorn: 220-260 (62.5 - 73.8%) -- guaranteed 2HKO after Leftovers recovery

View Ferrothorn counters → Teams with Ferrothorn →

Chansey

Normal DEFENSIVE CHECK View matchup

28.431

37.6

71.5% Standard error 8.47 points

DAMAGE CALC

0- Atk Diancie-Mega Diamond Storm vs. 252 HP / 0 Def Eviolite Chansey: 498-586 (70.7 - 83.2%) -- guaranteed 2HKO

View Chansey counters → Teams with Chansey →

Excadrill

GroundSteel OFFENSIVE CHECK View matchup

30.769

30.6

65.0% Standard error 8.60 points

DAMAGE CALC

252+ Atk Excadrill Iron Head vs. 252 HP / 0 Def Diancie-Mega: 544-648 (178.9 - 213.1%) -- guaranteed OHKO

View Excadrill counters → Teams with Excadrill →

Toxapex

PoisonWater DEFENSIVE CHECK View matchup

94.828

28.5

62.7% Standard error 8.56 points

DAMAGE CALC

252+ SpA Diancie-Mega Earth Power vs. 252 HP / 252+ SpD Toxapex: 142-168 (46.7 - 55.2%) -- 11.7% chance to 2HKO after Black Sludge recovery

View Toxapex counters → Teams with Toxapex →

Landorus-Therian

GroundFlying SOFT CHECK View matchup

166.89

28.3

54.8% Standard error 6.62 points

DAMAGE CALC

252+ Atk Landorus-Therian Earthquake vs. 252 HP / 0 Def Diancie-Mega: 360-426 (118.4 - 140.1%) -- guaranteed OHKO

View Landorus-Therian counters → Teams with Landorus-Therian →

Tapu Koko

ElectricFairy OFFENSIVE CHECK View matchup

47.485

20.5

60.5% Standard error 10.02 points

DAMAGE CALCElectric Terrain

252+ SpA Life Orb Tapu Koko Thunderbolt vs. 252 HP / 252+ SpD Diancie-Mega in Electric Terrain: 172-203 (56.5 - 66.7%) -- guaranteed 2HKO

View Tapu Koko counters → Teams with Tapu Koko →

Magearna

SteelFairy SOFT CHECK View matchup

109.515

18.3

51.0% Standard error 8.17 points

DAMAGE CALC

252+ SpA Magearna Fleur Cannon vs. 252 HP / 252+ SpD Diancie-Mega: 157-186 (51.6 - 61.1%) -- guaranteed 2HKO

View Magearna counters → Teams with Magearna →

Kartana

GrassSteel SOFT CHECK View matchup

23.932

0.4

40.5% Standard error 10.03 points

DAMAGE CALC

252+ Atk Kartana Smart Strike vs. 252 HP / 0 Def Diancie-Mega: 600-708 (197.3 - 232.8%) -- guaranteed OHKO

View Kartana counters → Teams with Kartana →

Tornadus-Therian

Flying SOFT CHECK View matchup

83.212

-5.8

28.1% Standard error 8.47 points

DAMAGE CALC

252+ SpA Tornadus-Therian Focus Blast vs. 252 HP / 252+ SpD Diancie-Mega: 86-102 (28.2 - 33.5%) -- 0.1% chance to 3HKO

View Tornadus-Therian counters → Teams with Tornadus-Therian →

Heatran

FireSteel SOFT CHECK View matchup

26.133

-12.3

17.2% Standard error 7.39 points

DAMAGE CALC

252+ SpA Heatran Earth Power vs. 252 HP / 252+ SpD Diancie-Mega: 146-174 (48 - 57.2%) -- 91.8% chance to 2HKO

View Heatran counters → Teams with Heatran →

Ranked #28 with 7.00% usage. Sorted by conservative score.