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

Mewtwo-Mega-X is ranked #29 in Gen 9 National Dex Ubers with 4.69% usage according to Smogon May 2026 - Jul 2026 data.

What beats Mewtwo-Mega-X 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 79.3% of 72.99089575120824 relevant encounters. Standard error is 6.7 points. Sets and switch conditions can change the result.

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

Mewtwo-Mega-X 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-X

PsychicFighting

USAGE 4.7% #29

BASE STATS

HP 106

ATK 190

DEF 100

SPA 154

SPD 100

SPE 130

BST780

TYPE MATCHUPS

2×

FlyingGhostFairy

½×

FightingRock

Moves

Low Kick 90.4% Stone Edge 80.8% Ice Beam 77.6% Electro Ball 43.5% Taunt 29.2% Bulk Up 14.5% Zen Headbutt 10.5% Drain Punch 9.5%

Items

Mewtwonite X 100.0%

Common Teammates

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

Explore Mewtwo-Mega-X + Marshadow teams 53 score Explore Mewtwo-Mega-X + Zacian-Crowned teams 48 score Explore Mewtwo-Mega-X + Groudon-Primal teams 25 score Explore Mewtwo-Mega-X + Yveltal teams 6 score Explore Mewtwo-Mega-X + Giratina-Origin teams 5 score Explore Mewtwo-Mega-X + Zygarde 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-X + Groudon-Primal 89.2% 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

72.991

52.6

79.3% Standard error 6.66 points

DAMAGE CALC

252+ Atk Marshadow Poltergeist vs. 252 HP / 0 Def Mewtwo-Mega-X: 384-452 (92.3 - 108.6%) -- 50% chance to OHKO

View Marshadow counters → Teams with Marshadow →

Zacian-Crowned

FairySteel OFFENSIVE CHECK View matchup

120.474

48.5

71.7% Standard error 5.80 points

DAMAGE CALC

+1 252+ Atk Zacian-Crowned Play Rough vs. 252 HP / 0 Def Mewtwo-Mega-X: 540-636 (129.8 - 152.8%) -- guaranteed OHKO

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

Groudon-Primal

GroundFire SOFT CHECK View matchup

137.882

25.3

54.0% Standard error 7.17 points

DAMAGE CALCHarsh Sunshine

252+ Atk Groudon-Primal Heat Crash (120 BP) vs. 252 HP / 0 Def Mewtwo-Mega-X in Harsh Sunshine: 414-487 (99.5 - 117%) -- 93.8% chance to OHKO

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

Yveltal

DarkFlying SOFT CHECK View matchup

133.593

6.0

33.5% Standard error 6.88 points

DAMAGE CALC

0- Atk Life Orb Dark Aura Yveltal Foul Play vs. 252 HP / 0 Def Mewtwo-Mega-X: 278-329 (66.8 - 79%) -- guaranteed 2HKO

View Yveltal counters → Teams with Yveltal →

Giratina-Origin

GhostDragon SOFT CHECK View matchup

29.025

5.4

42.0% Standard error 9.16 points

DAMAGE CALC

0- Atk Griseous Core Giratina-Origin Poltergeist vs. 252 HP / 0 Def Mewtwo-Mega-X: 300-354 (72.1 - 85%) -- guaranteed 2HKO

View Giratina-Origin counters → Teams with Giratina-Origin →

Zygarde

DragonGround SOFT CHECK View matchup

82.872

2.9

31.8% Standard error 7.22 points

DAMAGE CALC

252+ Atk Zygarde Thousand Arrows vs. 252 HP / 0 Def Mewtwo-Mega-X: 135-160 (32.4 - 38.4%) -- 98.7% chance to 3HKO

View Zygarde counters → Teams with Zygarde →

Necrozma-Dusk-Mane

PsychicSteel SOFT CHECK View matchup

46.925

2.6

43.5% Standard error 10.23 points

DAMAGE CALC

0- Atk Necrozma-Dusk-Mane Sunsteel Strike vs. 252 HP / 0 Def Mewtwo-Mega-X: 144-171 (34.6 - 41.1%) -- guaranteed 3HKO

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

Eternatus

PoisonDragon SOFT CHECK View matchup

26.549

-1.7

35.5% Standard error 9.29 points

DAMAGE CALC

252+ SpA Eternatus Draco Meteor vs. 252 HP / 252+ SpD Mewtwo-Mega-X: 183-216 (43.9 - 51.9%) -- 10.9% chance to 2HKO

View Eternatus counters → Teams with Eternatus →

Ho-Oh

FireFlying SOFT CHECK View matchup

88.078

-5.0

17.9% Standard error 5.73 points

DAMAGE CALC

252+ Atk Ho-Oh Brave Bird vs. 252 HP / 0 Def Mewtwo-Mega-X: 432-510 (103.8 - 122.5%) -- guaranteed OHKO

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

Arceus-Ground

Ground SOFT CHECK View matchup

62.041

-8.7

19.6% Standard error 7.08 points

DAMAGE CALC

252+ SpA Earth Plate Arceus-Ground Judgment vs. 252 HP / 252+ SpD Mewtwo-Mega-X: 147-174 (35.3 - 41.8%) -- guaranteed 3HKO

View Arceus-Ground counters → Teams with Arceus-Ground →

Kyogre-Primal

Water SOFT CHECK View matchup

45.998

-9.7

27.5% Standard error 9.30 points

DAMAGE CALCHeavy Rain

252+ SpA Kyogre-Primal Water Spout (150 BP) vs. 252 HP / 252+ SpD Mewtwo-Mega-X in Heavy Rain: 372-438 (89.4 - 105.2%) -- 31.3% chance to OHKO

View Kyogre-Primal counters →

Ranked #29 with 4.69% usage. Sorted by conservative score.