Is Diancie-Mega viable in Gen 9 National Dex?

Diancie-Mega is ranked #20 in Gen 9 National Dex with 9.25% usage according to Smogon May 2026 - Jul 2026 data.

What beats Diancie-Mega in Gen 9 National Dex?

Ogerpon-Wellspring has the strongest conservative score in this observed May 2026 - Jul 2026 sample. The target was knocked out or switched out in 82.9% of 180.22267299454762 relevant encounters. Standard error is 4.7 points. Sets and switch conditions can change the result.

How are Diancie-Mega matchup checks ranked in Gen 9 National Dex?

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 9 National Dex · Sorted by p − 4 standard errors · Smogon source period May 2026 - Jul 2026 · Generated 2026-08-05

#0719 Diancie-Mega

RockFairy

USAGE 9.3% #20

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 98.9% Diamond Storm 65.2% Earth Power 60.4% Mystical Fire 56.9% Stealth Rock 38.6% Endeavor 18.4% Substitute 17.2% Spikes 12.8%

Items

Diancite 100.0%

Common Teammates

Landorus-Therian38.9%

Ogerpon-Wellspring36.3%

Browse Gen 9 National Dex teams using Diancie-Mega →

Explore Diancie-Mega + Ogerpon-Wellspring teams 64 score Explore Diancie-Mega + Zamazenta teams 50 score Explore Diancie-Mega + Gholdengo teams 45 score

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 38.9% 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

Ogerpon-Wellspring

GrassWater OFFENSIVE CHECK View matchup

180.223

63.9

82.9% Standard error 4.75 points

DAMAGE CALC

252+ Atk Wellspring Mask Ogerpon-Wellspring Power Whip vs. 252 HP / 0 Def Diancie-Mega: 450-530 (148 - 174.3%) -- guaranteed OHKO

View Ogerpon-Wellspring counters → Teams with Ogerpon-Wellspring →

Scizor-Mega

BugSteel OFFENSIVE CHECK View matchup

113.367

53.5

79.1% Standard error 6.39 points

DAMAGE CALC

252+ Atk Technician Scizor-Mega Bullet Punch vs. 252 HP / 0 Def Diancie-Mega: 444-528 (146 - 173.6%) -- guaranteed OHKO

View Scizor-Mega counters →

Venusaur-Mega

GrassPoison DEFENSIVE CHECK View matchup

84.754

50.1

76.2% Standard error 6.51 points

DAMAGE CALC

0- Atk Diancie-Mega Diamond Storm vs. 252 HP / 0 Def Venusaur-Mega: 123-145 (33.7 - 39.8%) -- guaranteed 3HKO

View Venusaur-Mega counters →

Zamazenta

Fighting OFFENSIVE CHECK View matchup

265.486

49.7

68.3% Standard error 4.65 points

DAMAGE CALC

252+ Atk Zamazenta Heavy Slam (120 BP) vs. 252 HP / 0 Def Diancie-Mega: 500-592 (164.4 - 194.7%) -- guaranteed OHKO

View Zamazenta counters → Teams with Zamazenta →

Gholdengo

SteelGhost OFFENSIVE CHECK View matchup

294.785

45.1

64.1% Standard error 4.75 points

DAMAGE CALC

252+ SpA Gholdengo Make It Rain vs. 252 HP / 252+ SpD Diancie-Mega: 592-700 (194.7 - 230.2%) -- guaranteed OHKO

View Gholdengo counters → Teams with Gholdengo →

Melmetal

Steel DEFENSIVE CHECK View matchup

132.124

41.3

68.6% Standard error 6.83 points

DAMAGE CALC

252+ SpA Diancie-Mega Earth Power vs. 252 HP / 252+ SpD Melmetal: 238-280 (50.2 - 59%) -- guaranteed 2HKO

View Melmetal counters →

Chansey

Normal DEFENSIVE CHECK View matchup

28.965

39.5

72.6% Standard error 8.28 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 →

Swampert-Mega

WaterGround OFFENSIVE CHECK View matchup

20.945

39.2

76.4% Standard error 9.28 points

DAMAGE CALC

252+ Atk Swampert-Mega Earthquake vs. 252 HP / 0 Def Diancie-Mega: 368-434 (121 - 142.7%) -- guaranteed OHKO

View Swampert-Mega counters →

Gliscor

GroundFlying DEFENSIVE CHECK View matchup

253.898

39.0

59.9% Standard error 5.21 points

DAMAGE CALC

252+ SpA Diancie-Mega Moonblast vs. 252 HP / 252+ SpD Gliscor: 172-204 (48.5 - 57.6%) -- 94.5% chance to 2HKO

View Gliscor counters → Teams with Gliscor →

Ursaluna

GroundNormal OFFENSIVE CHECK View matchup

50.768

38.9

73.2% Standard error 8.57 points

DAMAGE CALC

252+ Atk Ursaluna Headlong Rush vs. 252 HP / 0 Def Diancie-Mega: 420-494 (138.1 - 162.5%) -- guaranteed OHKO

View Ursaluna counters →

Clodsire

PoisonGround DEFENSIVE CHECK View matchup

88.369

37.7

65.6% Standard error 6.99 points

DAMAGE CALC

252+ SpA Diancie-Mega Earth Power vs. 252 HP / 252+ SpD Clodsire: 182-216 (39.2 - 46.5%) -- guaranteed 3HKO after Black Sludge recovery

View Clodsire counters → Teams with Clodsire →

Iron Valiant

FairyFighting OFFENSIVE CHECK View matchup

70.247

37.3

68.2% Standard error 7.74 points

DAMAGE CALC

252+ Atk Iron Valiant Close Combat vs. 252 HP / 0 Def Diancie-Mega: 199-235 (65.4 - 77.3%) -- guaranteed 2HKO

View Iron Valiant counters → Teams with Iron Valiant →

Iron Treads

GroundSteel DEFENSIVE CHECK View matchup

172.695

37.0

62.1% Standard error 6.27 points

DAMAGE CALC

252+ SpA Diancie-Mega Earth Power vs. 252 HP / 252+ SpD Iron Treads: 226-268 (58.8 - 69.7%) -- guaranteed 2HKO after Leftovers recovery

View Iron Treads counters → Teams with Iron Treads →

Landorus-Therian

GroundFlying SOFT CHECK View matchup

268.395

34.0

54.2% Standard error 5.06 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 →

Urshifu-Rapid-Strike

FightingWater OFFENSIVE CHECK View matchup

87.69

33.4

62.2% Standard error 7.20 points

DAMAGE CALC

252+ Atk Urshifu-Rapid-Strike Surging Strikes (3 hits) vs. 252 HP / 0 Def Diancie-Mega on a critical hit: 384-456 (126.3 - 150%) -- guaranteed OHKO

View Urshifu-Rapid-Strike counters → Teams with Urshifu-Rapid-Strike →

Kingambit

DarkSteel SOFT CHECK View matchup

160.757

28.2

54.5% Standard error 6.57 points

DAMAGE CALC

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

View Kingambit counters → Teams with Kingambit →

Terapagos

Normal DEFENSIVE CHECK View matchup

137.805

27.2

56.0% Standard error 7.20 points

DAMAGE CALC

0- Atk Diancie-Mega Diamond Storm vs. 252 HP / 0 Def Terapagos: 168-198 (43.7 - 51.5%) -- 9.4% chance to 2HKO

View Terapagos counters → Teams with Terapagos →

Great Tusk

GroundFighting SOFT CHECK View matchup

177.855

24.0

48.9% Standard error 6.23 points

DAMAGE CALC

252+ Atk Great Tusk Headlong Rush vs. 252 HP / 0 Def Diancie-Mega: 402-474 (132.2 - 155.9%) -- guaranteed OHKO

View Great Tusk counters → Teams with Great Tusk →

Ting-Lu

DarkGround SOFT CHECK View matchup

130.829

22.8

52.3% Standard error 7.37 points

DAMAGE CALC

252+ Atk Ting-Lu Earthquake vs. 252 HP / 0 Def Diancie-Mega: 294-348 (96.7 - 114.4%) -- 81.3% chance to OHKO

View Ting-Lu counters → Teams with Ting-Lu →

Lopunny-Mega

NormalFighting OFFENSIVE CHECK View matchup

43.064

20.9

62.5% Standard error 10.41 points

DAMAGE CALC

252+ Atk Lopunny-Mega Close Combat vs. 252 HP / 0 Def Diancie-Mega: 205-243 (67.4 - 79.9%) -- guaranteed 2HKO

View Lopunny-Mega counters →

Diancie-Mega

RockFairy SOFT CHECK View matchup

46.141

20.6

50.0% Standard error 7.36 points

DAMAGE CALC

252+ SpA Diancie-Mega Earth Power vs. 252 HP / 252+ SpD Diancie-Mega: 170-202 (55.9 - 66.4%) -- guaranteed 2HKO

View Diancie-Mega counters → Teams with Diancie-Mega →

Keldeo

WaterFighting OFFENSIVE CHECK View matchup

31.274

20.2

55.7% Standard error 8.88 points

DAMAGE CALC

252+ SpA Keldeo Hydro Pump vs. 252 HP / 252+ SpD Diancie-Mega: 266-314 (87.5 - 103.2%) -- 18.8% chance to OHKO

View Keldeo counters →

Rillaboom

Grass SOFT CHECK View matchup

31.949

18.3

53.6% Standard error 8.82 points

DAMAGE CALCGrassy Terrain

252+ Atk Choice Band Rillaboom Wood Hammer vs. 252 HP / 0 Def Diancie-Mega in Grassy Terrain: 750-884 (246.7 - 290.7%) -- guaranteed OHKO

View Rillaboom counters →

Dragonite

DragonFlying SOFT CHECK View matchup

125.929

18.3

48.7% Standard error 7.61 points

DAMAGE CALC

252+ Atk Dragonite Earthquake vs. 252 HP / 0 Def Diancie-Mega: 226-268 (74.3 - 88.1%) -- guaranteed 2HKO

View Dragonite counters → Teams with Dragonite →

Tapu Lele

PsychicFairy SOFT CHECK View matchup

86.284

17.5

53.5% Standard error 9.00 points

DAMAGE CALCPsychic Terrain

252+ SpA Tapu Lele Future Sight vs. 252 HP / 252+ SpD Diancie-Mega in Psychic Terrain: 189-223 (62.1 - 73.3%) -- guaranteed 2HKO

View Tapu Lele counters → Teams with Tapu Lele →

Corviknight

FlyingSteel SOFT CHECK View matchup

180.817

10.9

33.9% Standard error 5.74 points

DAMAGE CALC

252+ Atk Corviknight Iron Head vs. 252 HP / 0 Def Diancie-Mega: 408-480 (134.2 - 157.8%) -- guaranteed OHKO

View Corviknight counters → Teams with Corviknight →

Toxapex

PoisonWater SOFT CHECK View matchup

140.91

9.1

36.2% Standard error 6.77 points

DAMAGE CALC

252+ SpA Toxapex Scald vs. 252 HP / 252+ SpD Diancie-Mega: 114-134 (37.5 - 44%) -- guaranteed 3HKO

View Toxapex counters → Teams with Toxapex →

Tapu Koko

ElectricFairy SOFT CHECK View matchup

56.343

7.4

44.5% Standard error 9.27 points

DAMAGE CALCElectric Terrain

252+ SpA Choice Specs Tapu Koko Thunderbolt vs. 252 HP / 252+ SpD Diancie-Mega in Electric Terrain: 171-202 (56.2 - 66.4%) -- guaranteed 2HKO

View Tapu Koko counters →

Ferrothorn

GrassSteel SOFT CHECK View matchup

93.455

7.1

41.0% Standard error 8.48 points

DAMAGE CALC

252+ Atk Ferrothorn Power Whip vs. 252 HP / 0 Def Diancie-Mega: 320-378 (105.2 - 124.3%) -- guaranteed OHKO

View Ferrothorn counters → Teams with Ferrothorn →

Raging Bolt

ElectricDragon SOFT CHECK View matchup

114.86

6.9

38.1% Standard error 7.79 points

DAMAGE CALC

252+ SpA Choice Specs Raging Bolt Thunderbolt vs. 252 HP / 252+ SpD Diancie-Mega: 169-201 (55.5 - 66.1%) -- guaranteed 2HKO

View Raging Bolt counters → Teams with Raging Bolt →

Ranked #20 with 9.25% usage. Sorted by conservative score.