Is Diancie-Mega viable in Gen 7 OU?

Diancie-Mega is ranked #33 in Gen 7 OU with 5.50% usage according to Smogon Jul 2026 - Sep 2026 data.

What beats Diancie-Mega in Gen 7 OU?

Jirachi has the strongest conservative score in this observed Jul 2026 - Sep 2026 sample. The target was knocked out or switched out in 87.8% of 23.943328839831363 relevant encounters. Standard error is 6.7 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 · Smogon source period Jul 2026 - Sep 2026

#0719 Diancie-Mega

RockFairy

USAGE 5.5% #33

ABILITYMagic Bounce

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 79.0% Stealth Rock 68.1% Diamond Storm 52.6% Earth Power 49.5% Endeavor 43.8% Substitute 41.8% Protect 28.0% Hidden Power Fire 14.7%

Items

Diancite 100.0%

Abilities

Magic Bounce100.0%

Common Teammates

Landorus-Therian60.6%

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 60.6% 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

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

55.761

50.8

74.3% Standard error 5.86 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

21.825

43.9

78.8% Standard error 8.74 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 →

Toxapex

PoisonWater DEFENSIVE CHECK View matchup

49.407

31.8

59.7% Standard error 6.98 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

96.716

30.0

50.3% Standard error 5.08 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

44.894

29.5

58.8% Standard error 7.35 points

DAMAGE CALCElectric Terrain

252+ SpA Tapu Koko Thunderbolt vs. 252 HP / 252+ SpD Diancie-Mega in Electric Terrain: 132-156 (43.4 - 51.3%) -- 4.7% chance to 2HKO

View Tapu Koko counters → Teams with Tapu Koko →

Magearna

SteelFairy SOFT CHECK View matchup

22.98

6.7

48.4% Standard error 10.42 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 →

Tornadus-Therian

Flying SOFT CHECK View matchup

22.112

-9.5

29.2% Standard error 9.67 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

20.987

-13.5

23.6% Standard error 9.27 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 #33 with 5.50% usage. Sorted by conservative score.