For Yellow, we rate Omastar C-Tier: a niche pick in Yellow's meta. At 540 BST, it fits the wallbreaker role. Hydro Pump anchors the moveset.

What is Omastar weak to?

In Yellow, watch for Exeggutor (Grass), Raikou (Electric), and Machamp (Fighting) when using Omastar. They all hit it super-effectively with STAB. Exeggutor is the most dangerous since Grass moves deal 4x damage. Ground-type attackers are also a problem. Omastar has enough bulk to absorb a hit, but don't push the matchup. Pivot to a teammate that resists.

What role does Omastar play in battle?

At base 55 Speed, it won't be moving first often. On offense, Omastar is a mixed attacker with base 60 Attack and 115 Special. Defensively? Tanky enough to absorb a few hits. Best used as a wallbreaker.

What are the best moves for Omastar?

In Yellow, run Hydro Pump, Blizzard, Rest, and Surf on Omastar. Hydro Pump is the most common pick at 17% usage. Surf provides reliable STAB damage.

What counters Omastar?

For Yellow, Omastar has answers, but so do you. Status moves (Toxic, Will-O-Wisp) wear it down. Setup sweepers can use it as a boost opportunity. Physical attackers can break through.

Omastar - Weakness, Evolution, Moveset, EVs & Stats

Mixed

Wallbreaker

CTier

55Speed · Slow

Stats & Training

Bulk defines Omastar's stat line. Defense and Special anchor the defensive side, but Speed can't keep up offensively. Tough to catch and worth 2 Defense stat exp.

Base Stats

High

HP70

Attack60

Defense125

Sp. Atk115

Sp. Def115

Speed55

Total540

Details

Catch Rate

Challenging45 / 255

Growth Rate

Medium Fast1M XP

Height1.0 m

Weight35.0 kg

Base XP173

Abilities

Abilities were introduced in Generation III. Shown below for reference.

Swift Swim

Doubles Speed during rain.

Shell Armor

Protects against critical hits.

Weak ArmorHA

Raises Speed and lowers Defense by one stage each upon being hit by a physical move.

EV Yield

HPAtkDef+2SpASpDSpe

Defense training target

Pokedex Entries

Sharp beaks ring its mouth. Its shell was too big for it to move freely, so it became extinct.

Yellow

Omastar Weakness

Omastar's Rock/Water typing leaves it vulnerable to Grass, Electric, Fighting, and Ground. Grass hits land at 4x, so they're the biggest threat. 5 resistances help offset the weaknesses. Omastar's overall bulk (70/125/115) lets it take a hit or two from most weaknesses before going down.

Omastar Weakness and Resistance Chart
Damage	Types
4x (Critical)	Grass
2x (Weak)	Electric, Fighting, Ground
0.5x (Resist)	Normal, Ice, Poison, Flying
0.25x (Resist)	Fire

Type ChartVulnerable

4Weak

5Resist

0Immune

Score-4

Gen I Type Chart

Only 15 types exist — Dark, Steel, and Fairy are absent
Ghost has no effect on Psychic (a known bug, fixed in Gen II)
Special stat governs both offense and defense — no Sp.Atk / Sp.Def split

4xCritical

Grass

2xWeak

Electric Fighting Ground

½xResist

Normal Ice Poison Flying

¼xResist

Fire

0xImmune

None

STAB (6)

Fire Ice Flying Bug Ground Rock

How to Beat Omastar in Yellow (Best Counters)

In Yellow, Jolteon's Thunderbolt hits Omastar for 67-79%. Golem's Earthquake hits Omastar for 75-89%.

Jolteon Electric	A
Recommended Build Moves ThunderboltSTAB Thunder Wave Double Kick Pin Missile Damage vs Omastar Thunderbolt 2x 67-79% Pin Missile 4-5% View Jolteon builds →
Golem RockGround	B
Recommended Build Moves EarthquakeSTAB Explosion Rock Slide Body Slam Damage vs Omastar Earthquake 2x 75-89% Explosion 31-36% Rock Slide 28-33% Body Slam 10-12% View Golem builds →
Victreebel GrassPoison	C
Recommended Build Moves Razor Leaf Wrap Sleep Powder Stun Spore Damage vs Omastar Wrap 2-2% View Victreebel builds →
Machamp Fighting	C
Recommended Build Moves Earthquake Body Slam SubmissionSTAB Low Kick Damage vs Omastar Earthquake 2x 53-63% Body Slam 11-13% Submission 2x 64-76% View Machamp builds →

Yellow Evolution

The Rock/Water-type Omastar caps Omanyte's chain at 540 stats. No daycare options for this one. Special grew the most through evolution (+60 over Omanyte), and Omastar peaks at 540 total stats. View every chain in the Evolution Chart.

How to Evolve

2 Forms

#138Omanyte

Level 40

#139Omastar

Stat Comparison 2 Stages

Omanyte

RockWater

Omastar

RockWater

70+35

ATK

60+20

DEF

100

125+25

SP.ATK

115+25

SP.DEF

70+15

SPE

55+20

BST

355D-Tier

495C-Tier+140

ROLE

Trick Room

Wallbreaker

TYPE

Special

Breeding not available · Introduced in Gen 2

Yellow Omastar Best Moveset

Best Build

Experimental

Utility

Ability

Not in Gen 1

Item

Not in Gen 1

Nature

Not in Gen 1

Utility Moveset

Hydro PumpSTAB
BlizzardCoverage
RestRecovery
SurfSTAB

Recommended Teammates

TaurosDecent

ChanseyDecent

SnorlaxDecent

Moves

Level-up moves are just the starting point for Omastar. TMs unlock Normal and Ice coverage and turn a straightforward STAB kit around Hydro Pump and Surf into something with actual range.

Level-Up Moves

Lv 1

Horn Attack

—6510025Normal

Lv 1

Water Gun

C4010025Water

Lv 1

Withdraw

D——40Water

Lv 34

Horn Attack

—6510025Normal

Lv 39

Leer

——10030Normal

Lv 44

Spike Cannon

—2010015Normal

Lv 49

Hydro Pump

S120805Water

TM Moves

TM34

Bide+1

———10Normal

TM14

Blizzard

S110905Ice

TM08

Body Slam

B8510015Normal

TM11

Bubble Beam

C6510020Water

TM32

Double Team

———15Normal

TM10

Double-Edge

C12010015Normal

TM07

Horn Drill

——305Normal

TM15

Hyper Beam

B150905Normal

TM13

Ice Beam

B9510010Ice

TM31

Mimic

———10Normal

TM20

Rage

—2010020Normal

TM33

Reflect

A——20Psychic

TM44

Rest

A——10Psychic

TM19

Seismic Toss

A—10020Fighting

TM40

Skull Bash

C10010010Normal

TM17

Submission

D808025Fighting

TM50

Substitute

C——10Normal

HM03

Surf

A9510015Water

TM09

Take Down

—908520Normal

TM06

Toxic

C—9010Poison

TM12

Water Gun

C4010025Water

Egg Moves

Omastar doesn't have any Egg moves

Tutor Moves

Omastar can't learn any Tutor moves

How to Get Omastar in Yellow

You're catching Omanyte first, not Omastar. Omanyte appears at solid rates in the encounters below. The step cards map the full 2-stage line with evolution methods between each stage.

How to Obtain Omastar in Yellow

Step 1Catch Omanyte
Cinnabar Island - Pokémon Lab
Gift from NPC Lv.30 Water
100%Mid
Revive Helix Fossil
Train until Level 40
Step 2Omastar ✓

Omastar Guide

For Yellow, we rate Omastar C-Tier: a niche pick in Yellow's meta. At 540 BST, it fits the wallbreaker role. Hydro Pump anchors the moveset.
In Yellow, watch for Exeggutor (Grass), Raikou (Electric), and Machamp (Fighting) when using Omastar. They all hit it super-effectively with STAB. Exeggutor is the most dangerous since Grass moves deal 4x damage. Ground-type attackers are also a problem. Omastar has enough bulk to absorb a hit, but don't push the matchup. Pivot to a teammate that resists.
At base 55 Speed, it won't be moving first often. On offense, Omastar is a mixed attacker with base 60 Attack and 115 Special. Defensively? Tanky enough to absorb a few hits. Best used as a wallbreaker.
In Yellow, run Hydro Pump, Blizzard, Rest, and Surf on Omastar. Hydro Pump is the most common pick at 17% usage. Surf provides reliable STAB damage.
For Yellow, Omastar has answers, but so do you. Status moves (Toxic, Will-O-Wisp) wear it down. Setup sweepers can use it as a boost opportunity. Physical attackers can break through.

Game Availability

One of the original 151, Omastar has appeared in 19 games — most mainline games. From Red & Blue through the latest titles, it's rarely been left out of a regional Pokedex.

Click a game to view version-specific details

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