Is Gyarados-Mega viable in Gen 9 National Dex?

Gyarados-Mega is ranked #55 in Gen 9 National Dex with 3.18% usage according to Smogon Jul 2026 - Sep 2026 data.

What beats Gyarados-Mega in Gen 9 National Dex?

Zamazenta has the strongest conservative score in this observed Jul 2026 - Sep 2026 sample. The target was knocked out or switched out in 63.8% of 20.433662846057373 relevant encounters. Standard error is 10.6 points. Sets and switch conditions can change the result.

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

Gyarados-Mega counters

Gen 9 National Dex · Smogon source period Jul 2026 - Sep 2026

#0130 Gyarados-Mega

WaterDark

USAGE 3.2% #55

ABILITYMold Breaker

BASE STATS

HP 95

ATK 155

DEF 109

SPA 70

SPD 130

SPE 81

BST640

TYPE MATCHUPS

2×

ElectricGrassFightingBugFairy

½×

FireWaterIceGhostDarkSteel

0×

Psychic

Moves

Dragon Dance 99.9% Waterfall 93.8% Crunch 72.4% Taunt 36.9% Substitute 33.2% Earthquake 29.1% Bounce 18.8% Temper Flare 7.0%

Items

Gyaradosite 100.0%

Abilities

Mold Breaker100.0%

Common Teammates

Bisharp20.7%

Leading observed checks

Open a matchup for a separate set-based damage estimate, or browse uploaded teams with both Pokémon.

Team core to explore

Gyarados-Mega + Volcarona 40.4% 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

Zamazenta

Fighting OFFENSIVE CHECK View matchup

20.434

21.3

63.8% Standard error 10.63 points

DAMAGE CALC

252+ Atk Zamazenta Close Combat vs. 252 HP / 0 Def Gyarados-Mega: 378-446 (95.9 - 113.1%) -- 75% chance to OHKO

View Zamazenta counters → Teams with Zamazenta →

Landorus-Therian

GroundFlying SOFT CHECK View matchup

82.859

-0.7

14.9% Standard error 3.92 points

DAMAGE CALC

252+ Atk Landorus-Therian Earthquake vs. 252 HP / 0 Def Gyarados-Mega: 181-214 (45.9 - 54.3%) -- 53.1% chance to 2HKO

View Landorus-Therian counters → Teams with Landorus-Therian →

Ogerpon-Wellspring

GrassWater SOFT CHECK View matchup

20.826

-7.9

33.5% Standard error 10.34 points

DAMAGE CALC

252+ Atk Wellspring Mask Ogerpon-Wellspring Power Whip vs. 252 HP / 0 Def Gyarados-Mega: 456-536 (115.7 - 136%) -- guaranteed OHKO

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

Alomomola

Water SOFT CHECK View matchup

23.565

-12.0

22.4% Standard error 8.59 points

DAMAGE CALC

252+ Atk Alomomola Liquidation vs. 252 HP / 0 Def Gyarados-Mega: 49-58 (12.4 - 14.7%) -- possible 7HKO

View Alomomola counters → Teams with Alomomola →

Zapdos

ElectricFlying SOFT CHECK View matchup

20.392

-14.2

23.2% Standard error 9.35 points

DAMAGE CALC

252+ SpA Zapdos Thunderbolt vs. 252 HP / 252+ SpD Gyarados-Mega: 188-224 (47.7 - 56.8%) -- 89.5% chance to 2HKO

View Zapdos counters → Teams with Zapdos →

Ranked #55 with 3.18% usage. Sorted by conservative score.