Is Mewtwo-Mega-Y viable in Gen 9 National Dex Ubers?

Mewtwo-Mega-Y is ranked #32 in Gen 9 National Dex Ubers with 4.17% usage according to Smogon May 2026 - Jul 2026 data.

What beats Mewtwo-Mega-Y in Gen 9 National Dex Ubers?

Marshadow has the strongest conservative score in this observed May 2026 - Jul 2026 sample. The target was knocked out or switched out in 83.7% of 23.969699419028714 relevant encounters. Standard error is 7.5 points. Sets and switch conditions can change the result.

How are Mewtwo-Mega-Y 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 Mewtwo-Mega-Y was knocked out or switched out. This is not a set-specific battle guarantee.

Mewtwo-Mega-Y counters

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

#0150 Mewtwo-Mega-Y

Psychic

USAGE 4.2% #32

BASE STATS

HP 106

ATK 150

DEF 70

SPA 194

SPD 120

SPE 140

BST780

TYPE MATCHUPS

2×

BugGhostDark

½×

FightingPsychic

Moves

Psystrike 95.9% Nasty Plot 70.7% Ice Beam 68.2% Earth Power 31.1% Fire Blast 28.2% Aura Sphere 20.2% Focus Blast 15.6% Thunderbolt 12.9%

Items

Mewtwonite Y 100.0%

Common Teammates

Necrozma-Dusk-Mane26.8%

Zygarde24.2%

Arceus-Fairy20.9%

Eternatus19.3%

Browse Gen 9 National Dex Ubers teams using Mewtwo-Mega-Y →

Explore Mewtwo-Mega-Y + Marshadow teams 53 score Explore Mewtwo-Mega-Y + Yveltal teams 41 score Explore Mewtwo-Mega-Y + Zacian-Crowned teams 37 score Explore Mewtwo-Mega-Y + Groudon-Primal teams 9 score Explore Mewtwo-Mega-Y + Necrozma-Dusk-Mane teams 3 score Explore Mewtwo-Mega-Y + Ho-Oh teams -3 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

Mewtwo-Mega-Y + Groudon-Primal 75.6% 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

Marshadow

FightingGhost OFFENSIVE CHECK View matchup

23.97

53.5

83.7% Standard error 7.55 points

DAMAGE CALC

252+ Atk Marshadow Poltergeist vs. 252 HP / 0 Def Mewtwo-Mega-Y: 516-608 (124 - 146.1%) -- guaranteed OHKO

View Marshadow counters → Teams with Marshadow →

Yveltal

DarkFlying OFFENSIVE CHECK View matchup

103.671

41.5

71.7% Standard error 7.55 points

DAMAGE CALC

0- Atk Life Orb Dark Aura Yveltal Foul Play vs. 252 HP / 0 Def Mewtwo-Mega-Y: 603-712 (144.9 - 171.1%) -- guaranteed OHKO

View Yveltal counters → Teams with Yveltal →

Zacian-Crowned

FairySteel OFFENSIVE CHECK View matchup

62.739

37.1

69.3% Standard error 8.05 points

DAMAGE CALC

+1 252+ Atk Zacian-Crowned Play Rough vs. 252 HP / 0 Def Mewtwo-Mega-Y: 361-426 (86.7 - 102.4%) -- 18.8% chance to OHKO

View Zacian-Crowned counters → Teams with Zacian-Crowned →

Groudon-Primal

GroundFire SOFT CHECK View matchup

57.224

9.1

46.0% Standard error 9.21 points

DAMAGE CALCHarsh Sunshine

252+ Atk Groudon-Primal Heat Crash (120 BP) vs. 252 HP / 0 Def Mewtwo-Mega-Y in Harsh Sunshine: 553-652 (132.9 - 156.7%) -- guaranteed OHKO

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

Necrozma-Dusk-Mane

PsychicSteel SOFT CHECK View matchup

23.477

2.6

43.6% Standard error 10.23 points

DAMAGE CALC

0- Atk Necrozma-Dusk-Mane Sunsteel Strike vs. 252 HP / 0 Def Mewtwo-Mega-Y: 193-228 (46.3 - 54.8%) -- 59% chance to 2HKO

View Necrozma-Dusk-Mane counters → Teams with Necrozma-Dusk-Mane →

Ho-Oh

FireFlying SOFT CHECK View matchup

61.813

-3.5

28.6% Standard error 8.02 points

DAMAGE CALC

252+ Atk Ho-Oh Brave Bird vs. 252 HP / 0 Def Mewtwo-Mega-Y: 288-340 (69.2 - 81.7%) -- guaranteed 2HKO

View Ho-Oh counters → Teams with Ho-Oh →

Zygarde

DragonGround SOFT CHECK View matchup

28.586

-10.6

18.2% Standard error 7.22 points

DAMAGE CALC

252+ Atk Zygarde Thousand Arrows vs. 252 HP / 0 Def Mewtwo-Mega-Y: 180-213 (43.2 - 51.2%) -- 5.1% chance to 2HKO

View Zygarde counters → Teams with Zygarde →

Eternatus

PoisonDragon SOFT CHECK View matchup

26.718

-12.2

16.6% Standard error 7.19 points

DAMAGE CALC

252+ SpA Eternatus Draco Meteor vs. 252 HP / 252+ SpD Mewtwo-Mega-Y: 160-190 (38.4 - 45.6%) -- guaranteed 3HKO

View Eternatus counters → Teams with Eternatus →

Ranked #32 with 4.17% usage. Sorted by conservative score.