Is Diancie-Mega viable in Gen 9 National Dex Ubers?

Diancie-Mega is ranked #39 in Gen 9 National Dex Ubers with 2.69% usage according to Smogon May 2026 - Jul 2026 data.

What beats Diancie-Mega in Gen 9 National Dex Ubers?

Groudon-Primal has the strongest conservative score in this observed May 2026 - Jul 2026 sample. The target was knocked out or switched out in 64.4% of 54.21645998043725 relevant encounters. Standard error is 9.1 points. Sets and switch conditions can change the result.

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

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

#0719 Diancie-Mega

RockFairy

USAGE 2.7% #39

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 95.1% Earth Power 86.4% Diamond Storm 73.4% Stealth Rock 34.9% Substitute 20.7% Trick Room 20.2% Explosion 10.8% Protect 10.4%

Items

Diancite 100.0%

Common Teammates

Groudon-Primal47.6%

Yveltal39.1%

Zacian-Crowned34.3%

Necrozma-Dusk-Mane26.5%

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 + Groudon-Primal 47.6% 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

Groudon-Primal

GroundFire OFFENSIVE CHECK View matchup

54.216

27.8

64.4% Standard error 9.15 points

DAMAGE CALCHarsh Sunshine

252+ Atk Groudon-Primal Precipice Blades vs. 252 HP / 0 Def Diancie-Mega: 510-600 (167.7 - 197.3%) -- guaranteed OHKO

View Groudon-Primal counters → Teams with Groudon-Primal →

Zygarde

DragonGround SOFT CHECK View matchup

28.998

12.8

50.0% Standard error 9.29 points

DAMAGE CALC

252+ Atk Zygarde Thousand Arrows vs. 252 HP / 0 Def Diancie-Mega: 248-294 (81.5 - 96.7%) -- guaranteed 2HKO

View Zygarde counters → Teams with Zygarde →

Yveltal

DarkFlying SOFT CHECK View matchup

54.535

-12.6

12.1% Standard error 6.17 points

DAMAGE CALC

0- Atk Life Orb Dark Aura Yveltal Foul Play vs. 252 HP / 0 Def Diancie-Mega: 109-130 (35.8 - 42.7%) -- guaranteed 3HKO

View Yveltal counters → Teams with Yveltal →

Ranked #39 with 2.69% usage. Sorted by conservative score.