In Emerald, Swift Swim changes the entire equation for Omastar. The 495 BST doesn't tell the full story. Ranked C-Tier as a hazard setter. Ice Beam with Leftovers is the standard set.

What is Omastar weak to?

In Emerald, 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.

What is the best ability for Omastar?

Swift Swim is what you want on Omastar. Every competitive set worth running is built with that ability in mind. The alternatives (Shell Armor, Weak Armor) work on paper but Swift Swim is what makes Omastar worth using.

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 Sp. Atk. Defensively? Enough bulk to take a hit or two. Best used as a hazard setter.

What are the best moves for Omastar?

In Emerald, run Ice Beam, Raindance, Spikes, and Hydro Pump on Omastar. Ice Beam is the most common pick at 22% usage. This set covers the hazard setter role with a mix of damage and utility.

Omastar - Weakness, Evolution, Moveset, EVs & Stats

Mixed

Hazard Setter

CTier

55Speed · Slow

Stats & Training

Defense and Sp. Atk carry most of Omastar's stat budget. Speed's the obvious dump stat. Tough to catch and yields 2 Defense EVs. Follows a medium-fast 1M XP curve.

Base Stats

Above

HP70

Attack60

Defense125

Sp. Atk115

Sp. Def70

Speed55

Total495

Details

Catch Rate

Challenging45 / 255

Growth Rate

Medium Fast1M XP

Height1.0 m

Weight35.0 kg

Base XP173

Abilities

Swift SwimTop Pick

Doubles Speed during rain.

Shell ArmorNiche

Protects against critical hits.

Weak ArmorHANot in game

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

An OMASTAR uses its tentacles to capture its prey. It is believed to have become extinct because its shell grew too large, making its movements slow and ponderous.

Emerald

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 physical bulk (base 125 Def) helps cushion physical weakness hits, but special attackers are the bigger threat.

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 III Type Chart

Dark and Steel types added — Fairy does not exist yet
Moves are Physical or Special based on type, not per move

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 Emerald (Best Counters)

In Emerald, Magneton can KO Omastar with Thunderbolt (145-171%). Forretress's Earthquake hits Omastar for 39-46%. Heracross deals 57-67% with Megahorn.

Magneton ElectricSteel	A
Recommended Build AbilityMagnetpull ItemMagnet NatureModest Moves ThunderboltSTAB Hidden Power Fire ToxicUtility Thunder Wave Damage vs Omastar Thunderbolt 2x 145-171%KO View Magneton builds →
ForretressThreatens with Spikes, sturdy guarantees survival, walls physical sets BugSteel	B
Recommended Build AbilitySturdy ItemLeftovers NatureCareful Moves SpikesHazard Rapid Spin Explosion Earthquake Damage vs Omastar Rapid Spin 5-6% Explosion 24-28% Earthquake 2x 39-46% View Forretress builds →
Heracross BugFighting	B
Recommended Build AbilitySwarm ItemSalacberry NatureJolly Moves MegahornSTAB Rock Slide Swords Dance SubstituteUtility Damage vs Omastar Megahorn 57-67% Rock Slide 23-28% View Heracross builds →
Breloom GrassFighting	B
Recommended Build AbilityEffect Spore ItemLeftovers NatureJolly Moves SporeUtility Focus Punch Mach Punch Sky Uppercut Damage vs Omastar Mach Punch 2x 40-47% View Breloom builds →

Emerald Evolution

Evolved from Omanyte. Omastar is the final form in this two-stage line. Plenty of partners for breeding via two egg groups. Eggs are slow to hatch. HP grew the most through evolution (+35 over Omanyte), and Omastar peaks at 495 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

Moderate

Breed with Omastar to get Omanyte eggs using 58 partners from the Water1 and Water3 egg groups. Notable egg moves include Aurora Beam, Bubble Beam, Haze and 4 more.

Egg Groups

Water1Water3

Gender

♂87.5%♀12.5%

Hatch Time

30 cycles·7,710 steps

Moderate~8 min with Flame Body

Egg Moves

7moves

Breed With (best first)

Emerald Omastar Best Moveset

Swiftswim helps Omastar stick around while dealing real damage. Leftovers for passive recovery each turn, max Sp. Atk and Speed EVs for the right balance, and Ice Beam as the main threat. Not the fastest, but it doesn't need to be.

Best Build

Solid pick

Special Attacker

Ability

Swift Swim

Item

LeftoversSUSTAIN

Best Nature for Omastar

Modest+SPA

Omastar best EVs are Sp. Atk and Speed

EVs

SpA

SpD

Spe

Special Attacker Moveset

Ice Beam
Rain DanceSTAB
SpikesHazard
Hydro PumpSTAB

Recommended Teammates

LudicoloDecent

KingdraDecent

CelebiDecent

Moves

You'll want to breed for Aurora Beam and Bubble Beam on Omastar. These egg moves aren't just nice to have. Combined with STAB from Hydro Pump and Surf, they expand what Omastar can actually threaten in practice.

Level-Up Moves

Lv 1

Bite

D6010025Dark

Lv 1

Constrict

—1010035Normal

Lv 1

Withdraw

———40Water

Lv 13

Bite

D6010025Dark

Lv 19

Water Gun

—4010025Water

Lv 25

Mud Shot

—559515Ground

Lv 31

Leer

——10030Normal

Lv 37

Protect+4

C——10Normal

Lv 40

Spike Cannon

—2010015Normal

Lv 46

Tickle

——10020Normal

Lv 55

Ancient Power

C601005Rock

Lv 65

Hydro Pump

A120805Water

TM Moves

TM45

Attract

——10015Normal

TM14

Blizzard

C120705Ice

HM08

Dive

—6010010Water

TM32

Double Team

———15Normal

TM42

Facade

D7010020Normal

TM21

Frustration

——10020Normal

TM07

Hail

———10Ice

TM10

Hidden Power

—6010015Normal

TM15

Hyper Beam

B150905Normal

TM13

Ice Beam

S9510010Ice

TM17

Protect+4

C——10Normal

TM18

Rain Dance

S——5Water

TM44

Rest

C——10Psychic

TM27

Return

D—10020Normal

HM06

Rock Smash

—2010015Fighting

TM39

Rock Tomb

—609510Rock

TM37

Sandstorm

———10Rock

TM43

Secret Power

—7010020Normal

HM03

Surf

A9510015Water

TM46

Thief

D6010025Dark

TM06

Toxic

C—8510Poison

TM03

Water Pulse

—6010020Water

HM07

Waterfall

C8010015Water

Egg Moves

Egg

Aurora Beam

—6510020Ice

Egg

Bubble Beam

—6510020Water

Egg

Haze

D——30Ice

Egg

Rock Slide

C759010Rock

Egg

Slam

—807520Normal

Egg

Spikes

S——20Ground

Egg

Supersonic

——5520Normal

Tutor Moves

Tut

Tutor

Body Slam

D8510015Normal

Tutor

Double-Edge

C12010015Normal

Tutor

Endure+4

D——10Normal

Tutor

Icy Wind

—559515Ice

Tutor

Mimic

———10Normal

Tutor

Rock Slide

C759010Rock

Tutor

Rollout

—309020Rock

Tutor

Seismic Toss

D—10020Fighting

Tutor

Sleep Talk

D——10Normal

Tutor

Snore

—4010015Normal

Tutor

Substitute

C——10Normal

Tutor

Swagger

——9015Normal

How to Get Omastar in Emerald

No wild encounters for Omastar in Emerald. Bring Omanyte over from Red, Yellow, or Sword, then level through the stages. Each step in the chain is laid out below.

How to Obtain Omastar in Emerald

Step 1Obtain Omanyte
Receive as a gift in:
FireRedGift · Cinnabar Island · Revive Helix Fossil
Then trade to Emerald to continue the evolution chain.
Also found in:
Red Yellow Diamond Platinum HeartGold Black
Train until Level 40
Step 2Omastar ✓

Omastar Guide

In Emerald, Swift Swim changes the entire equation for Omastar. The 495 BST doesn't tell the full story. Ranked C-Tier as a hazard setter. Ice Beam with Leftovers is the standard set.
In Emerald, 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.
Swift Swim is what you want on Omastar. Every competitive set worth running is built with that ability in mind. The alternatives (Shell Armor, Weak Armor) work on paper but Swift Swim is what makes Omastar worth using.
At base 55 Speed, it won't be moving first often. On offense, Omastar is a mixed attacker with base 60 Attack and 115 Sp. Atk. Defensively? Enough bulk to take a hit or two. Best used as a hazard setter.
In Emerald, run Ice Beam, Raindance, Spikes, and Hydro Pump on Omastar. Ice Beam is the most common pick at 22% usage. This set covers the hazard setter role with a mix of damage and utility.

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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