Is Gyarados viable in Gen 4 OU?

Gyarados is ranked #5 in Gen 4 OU with 26.69% usage according to Smogon May 2026 - Jul 2026 data.

What beats Gyarados in Gen 4 OU?

Jirachi has the strongest conservative score in this observed May 2026 - Jul 2026 sample. The target was knocked out or switched out in 56.5% of 89.30590261329613 relevant encounters. Standard error is 9.0 points. Sets and switch conditions can change the result.

How are Gyarados matchup checks ranked in Gen 4 OU?

They are ranked by p minus four standard errors. Here, p is the observed fraction of relevant encounters where Gyarados was knocked out or switched out. This is not a set-specific battle guarantee.

Gyarados counters

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

#0130 Gyarados

WaterFlying

USAGE 26.7% #5

BASE STATS

HP 95

ATK 125

DEF 79

SPA 60

SPD 100

SPE 81

BST540

TYPE MATCHUPS

4×

Electric

2×

Rock

½×

FireWaterFightingBugSteel

0×

Ground

Moves

Waterfall 100.0% Dragon Dance 72.5% Earthquake 44.4% Outrage 26.4% Ice Fang 25.3% Substitute 24.2% Taunt 22.1% Stone Edge 16.9%

Items

Leftovers 48.7% Lum Berry 25.3% Choice Band 15.4% Wacan Berry 8.7% Choice Scarf 1.3% Life Orb 0.2% Focus Sash 0.1% Enigma Berry 0.1%

Common Teammates

Browse Gen 4 OU teams using Gyarados →

Explore Gyarados + Jirachi teams 20 score Explore Gyarados + Latias teams 18 score Explore Gyarados + Flygon teams 8 score Explore Gyarados + Gyarados teams 7 score Explore Gyarados + Tyranitar teams -10 score Explore Gyarados + Heatran teams -15 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

Gyarados + Tyranitar 63.1% 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

Jirachi

SteelPsychic DEFENSIVE CHECK View matchup

89.306

20.3

56.5% Standard error 9.04 points

DAMAGE CALC

252+ Atk Gyarados Earthquake vs. 252 HP / 252+ Def Jirachi: 170-200 (42 - 49.5%) -- guaranteed 3HKO after Leftovers recovery

View Jirachi counters → Teams with Jirachi →

Latias

DragonPsychic SOFT CHECK View matchup

105.219

18.5

52.0% Standard error 8.38 points

DAMAGE CALC

252+ SpA Choice Specs Latias Thunderbolt vs. 252 HP / 252+ SpD Gyarados: 436-516 (110.6 - 130.9%) -- guaranteed OHKO

View Latias counters → Teams with Latias →

Flygon

GroundDragon SOFT CHECK View matchup

23.877

7.5

48.5% Standard error 10.23 points

DAMAGE CALC

252+ Atk Flygon Thunder Punch vs. 252 HP / 0 Def Gyarados: 364-432 (92.3 - 109.6%) -- 56.3% chance to OHKO

View Flygon counters → Teams with Flygon →

Gyarados

WaterFlying SOFT CHECK View matchup

76.923

6.7

46.0% Standard error 9.84 points

DAMAGE CALC

252+ Atk Gyarados Stone Edge vs. 252 HP / 0 Def Gyarados: 282-334 (71.5 - 84.7%) -- guaranteed 2HKO after Leftovers recovery

View Gyarados counters → Teams with Gyarados →

Tyranitar

RockDark SOFT CHECK View matchup

75.38

-10.1

23.8% Standard error 8.48 points

DAMAGE CALCSand

252+ Atk Choice Band Tyranitar Stone Edge vs. 252 HP / 0 Def Gyarados: 668-788 (169.5 - 200%) -- guaranteed OHKO

View Tyranitar counters → Teams with Tyranitar →

Heatran

FireSteel SOFT CHECK View matchup

22.99

-15.1

11.2% Standard error 6.58 points

DAMAGE CALC

252+ Atk Heatran Explosion vs. 252 HP / 0 Def Gyarados: 564-664 (143.1 - 168.5%) -- guaranteed OHKO

View Heatran counters → Teams with Heatran →

Ranked #5 with 26.69% usage. Sorted by conservative score.