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

Mewtwo-Mega-X is ranked #38 in Gen 9 National Dex Ubers with 3.23% usage according to Smogon Jul 2026 - Sep 2026 data.

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

Zacian-Crowned has the strongest conservative score in this observed Jul 2026 - Sep 2026 sample. The target was knocked out or switched out in 85.1% of 42.83162221874617 relevant encounters. Standard error is 5.4 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 · Smogon source period Jul 2026 - Sep 2026

#0150 Mewtwo-Mega-X

PsychicFighting

USAGE 3.2% #38

ABILITYSteadfast

BASE STATS

HP 106

ATK 190

DEF 100

SPA 154

SPD 100

SPE 130

BST780

TYPE MATCHUPS

2×

FlyingGhostFairy

½×

FightingRock

Moves

Low Kick 89.2% Stone Edge 67.3% Ice Beam 63.4% Psychic 41.0% Taunt 26.7% Knock Off 21.4% Zen Headbutt 15.6% Ice Punch 15.1%

Items

Mewtwonite X 100.0%

Abilities

Steadfast100.0%

Common Teammates

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

Explore Mewtwo-Mega-X + Zacian-Crowned teams 63 score Explore Mewtwo-Mega-X + Groudon-Primal teams 32 score Explore Mewtwo-Mega-X + Yveltal teams 28 score Explore Mewtwo-Mega-X + Giratina-Origin teams 14 score Explore Mewtwo-Mega-X + Zygarde teams -1 score Explore Mewtwo-Mega-X + 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-X + Groudon-Primal 69.2% 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

Zacian-Crowned

FairySteel OFFENSIVE CHECK View matchup

42.832

63.4

85.1% Standard error 5.44 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

77.739

31.9

54.5% Standard error 5.65 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

84.824

27.8

49.6% Standard error 5.43 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 DEFENSIVE CHECK View matchup

21.509

14.0

56.7% Standard error 10.68 points

DAMAGE CALC

252+ Atk Mewtwo-Mega-X Ice Punch vs. 252 HP / 252+ Def Giratina-Origin: 174-206 (34.5 - 40.8%) -- guaranteed 3HKO

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

Zygarde

DragonGround SOFT CHECK View matchup

47.283

-0.6

24.4% Standard error 6.24 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 →

Ho-Oh

FireFlying SOFT CHECK View matchup

65.354

-3.1

14.2% Standard error 4.32 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

24.817

-12.0

20.3% Standard error 8.07 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 →

Alomomola

Water SOFT CHECK View matchup

22.587

-15.4

11.5% Standard error 6.72 points

DAMAGE CALC

252+ Atk Alomomola Flip Turn vs. 252 HP / 0 Def Mewtwo-Mega-X: 76-90 (18.2 - 21.6%) -- possible 5HKO

View Alomomola counters →

Ranked #38 with 3.23% usage. Sorted by conservative score.