National Pokédex #0139 · Generation 1

Omastar

Omastar uses its tentacles to capture its prey. It is believed to have become extinct because its shell grew too large and heavy, causing its movements to become too slow and ponderous.

Natural spawnRaid den

Quick answer

How do you get Omastar?

Omastar can spawn in Lush Caves, Cave Underground Jungle, Cave Fungal Caves (Search: On land; Sky light: Dark; Ground: Natural). It appears in tier 4 raids. Check the complete conditions below; these routes reflect AshRun's installed ATMons files.

AshRun ATMons 1.3.0 · Checked 2026-10-16 · Sources & limitations

AshRun locations

How to obtain Omastar

2 places to look

Where to look in the wild

Choose one location below and meet its conditions together. Separate cards are alternative routes. A rarity label describes a spawn pool, not the chance of finding one on each attempt.

Eligible biomes (3)

Lush Caves + 2 more

Expanded from server category: Lush

Level40-50RarityUltra-Rare

Search: On land
Sky light: Dark
Ground: Natural

Excluded when this matches: Ground: Farmland.

Eligible biomes (3)

Lush Caves + 2 more

Expanded from server category: Lush

Level40-50RarityUltra-Rare

Search: Underwater
Sky light: Dark
Fluid: Water

Raid den

Tier 4 · Rock

Relative boss weight 20. Defined moves: Brine, Ancient Power, Mud Shot, Water Gun.

Compare raid tiers and encounters →

Before you throw a ball

Catching Omastar

If you encounter a wild Omastar, an ordinary throw outside battle requires your first non-fainted party Pokémon to be at least its level.

Party order matters: the game checks the first conscious Pokémon, not the highest level anywhere in your team.
With no conscious party Pokémon, this outside-battle rule allows only targets up to level 15.
A guaranteed-catch ball bypasses this ordinary level check. You can also battle a wild target and use a ball during your turn.

These rules describe wild encounters. Raids and scripted encounters may use their own capture flow. Read the catching guide and blocked-throw checklist · Checked 2026-10-16.

Base catch-rate value: 45. This is a species value, not a percentage or a promise that a particular ball will work.

Battle profile

Base stats

495 total

Type weaknesses & resistances

Damage taken by Omastar with Rock / Water typing:

Weak to: Electric 2×Fighting 2×Grass 4×Ground 2×
Resists: Fire 0.25×Flying 0.5×Ice 0.5×Normal 0.5×Poison 0.5×
Immune to: None by typing alone

Unlisted move types deal normal (1×) damage. Both types are combined. Abilities, held items, moves, weather, Terastallization and form changes can alter the result.

Base stat values

Hp70

Attack60

Defence125

Special Attack115

Special Defence70

Speed55

Abilities

Swift Swim
Shell Armor
Weak Armor Hidden

Training

Base experience: 173
Growth: Medium Fast
EV yield: Hp: 0 · Attack: 0 · Defence: 2 · Special Attack: 0 · Special Defence: 0 · Speed: 0
Friendship: 50

Progression

Evolution & forms

Follow the requirements on each arrow, then open the next Pokémon to continue the chain. Regional and alternate forms can use different rules. Compare all evolution methods.

Evolves from

Omanyte

level it up; reach level 40

Find Omanyte →

No further evolution is listed for this Pokémon or its recorded forms.

Complete installed learnset

Moves

129 entries

Level moves (19)

Lv. 1 · ConstrictLv. 1 · WithdrawLv. 1 · BiteLv. 1 · RolloutLv. 1 · Spike CannonLv. 1 · TickleLv. 1 · BindLv. 1 · CrunchLv. 1 · Sand AttackLv. 15 · Water GunLv. 20 · LeerLv. 25 · Mud ShotLv. 30 · Ancient PowerLv. 35 · BrineLv. 43 · ProtectLv. 49 · Rock BlastLv. 56 · SurfLv. 63 · Shell SmashLv. 70 · Hydro Pump

Egg moves (12)

Aurora BeamBideBiteBubble BeamHazeKnock OffReflect TypeSlamSupersonicTickleWater PulseWring Out

Tm moves (51)

Ancient PowerBindBlizzardBody SlamBrineCrunchDiveEarth PowerEndureFacadeGiga ImpactGyro BallHailHazeHeadbuttHydro PumpHyper BeamIce BeamIcy WindIron DefenseKnock OffLiquidationMeteor BeamMuddy WaterMud ShotPin MissileProtectRain DanceRestRock BlastRock ClimbRock PolishRock SlideRock SmashRock TombRolloutSandstormScaldSleep TalkSmack DownSpikesStealth RockStone EdgeSubstituteSurfTera BlastThiefToxic SpikesWaterfallWater PulseWhirlpool

Tutor moves (21)

Ancient PowerBindDiveEarth PowerGiga ImpactHyper BeamIce BeamIcy WindIron DefenseKnock OffLiquidationMeteor BeamRestRock SlideRock SmashRolloutSleep TalkSpikesStealth RockStone EdgeWater Pulse

Legacy moves (26)

AttractCaptivateConfideCurseDouble-EdgeDouble TeamFrustrationHidden PowerHorn AttackHorn DrillMimicNatural GiftRageReflectReturnRock ThrowRoundSecret PowerSeismic TossSkull BashSnoreSpike CannonSubmissionSwaggerTake DownToxic

Useful extras

Drops & breeding

Nautilus Shell

Quantity 1

Bone Meal

10% chance

Egg groups: Water 1, Water 3
Egg cycles: 30
Maximum drops: 2

Technical server dataRaw records, internal IDs, source files, presets, and full JSON

Source summary

Base species: Cobblemon-neoforge-1.7.3+1.21.1.jar. Installed additions: none.

Acquisition records

{
  "questGuides": [],
  "structureEncounters": [],
  "naturalSpawns": [
    {
      "id": "omastar-1",
      "pokemon": "omastar",
      "presets": [
        "natural"
      ],
      "type": "pokemon",
      "spawnablePositionType": "grounded",
      "bucket": "ultra-rare",
      "level": "40-50",
      "weight": 4,
      "condition": {
        "minSkyLight": 0,
        "maxSkyLight": 7,
        "biomes": [
          "#cobblemon:is_lush"
        ]
      },
      "source": "Cobblemon-neoforge-1.7.3+1.21.1.jar",
      "sourceFile": "data/cobblemon/spawn_pool_world/0139_omastar.json",
      "formProperties": [],
      "presetConditions": [
        {
          "preset": "natural",
          "condition": {
            "neededBaseBlocks": [
              "#cobblemon:natural"
            ]
          }
        }
      ],
      "presetAntiConditions": [
        {
          "preset": "natural",
          "condition": {
            "neededBaseBlocks": [
              "minecraft:farmland"
            ]
          }
        }
      ],
      "presetProvenance": [
        {
          "preset": "natural",
          "source": "Cobblemon-neoforge-1.7.3+1.21.1.jar",
          "sourceFile": "data/cobblemon/spawn_detail_presets/natural.json"
        }
      ],
      "effectiveCondition": {
        "minSkyLight": 0,
        "maxSkyLight": 7,
        "biomes": [
          "#cobblemon:is_lush"
        ],
        "neededBaseBlocks": [
          "#cobblemon:natural"
        ]
      },
      "effectiveAnticonditions": [
        {
          "neededBaseBlocks": [
            "minecraft:farmland"
          ]
        }
      ],
      "resolvedBiomes": [
        "minecraft:lush_caves",
        "terralith:cave/underground_jungle",
        "terralith:cave/fungal_caves"
      ],
      "resolvedExcludedBiomes": []
    },
    {
      "id": "omastar-2",
      "pokemon": "omastar",
      "presets": [
        "water"
      ],
      "type": "pokemon",
      "spawnablePositionType": "submerged",
      "bucket": "ultra-rare",
      "level": "40-50",
      "weight": 4,
      "condition": {
        "minSkyLight": 0,
        "maxSkyLight": 7,
        "biomes": [
          "#cobblemon:is_lush"
        ]
      },
      "source": "Cobblemon-neoforge-1.7.3+1.21.1.jar",
      "sourceFile": "data/cobblemon/spawn_pool_world/0139_omastar.json",
      "formProperties": [],
      "presetConditions": [
        {
          "preset": "water",
          "condition": {
            "fluid": "#minecraft:water"
          }
        }
      ],
      "presetAntiConditions": [],
      "presetProvenance": [
        {
          "preset": "water",
          "source": "Cobblemon-neoforge-1.7.3+1.21.1.jar",
          "sourceFile": "data/cobblemon/spawn_detail_presets/water.json"
        }
      ],
      "effectiveCondition": {
        "minSkyLight": 0,
        "maxSkyLight": 7,
        "biomes": [
          "#cobblemon:is_lush"
        ],
        "fluid": "#minecraft:water"
      },
      "effectiveAnticonditions": [],
      "resolvedBiomes": [
        "minecraft:lush_caves",
        "terralith:cave/underground_jungle",
        "terralith:cave/fungal_caves"
      ],
      "resolvedExcludedBiomes": []
    }
  ],
  "raids": [
    {
      "tier": "FOUR",
      "type": "rock",
      "weight": 20,
      "moves": [
        "brine",
        "ancientpower",
        "mudshot",
        "watergun"
      ],
      "source": "cobblemonraiddens-neoforge-0.11.7+1.21.1.jar",
      "sourceFile": "data/cobblemonraiddens/raid/boss/omastar.json",
      "formProperties": [],
      "gender": null,
      "ability": null,
      "bossProperties": []
    }
  ],
  "fossils": []
}

Evolution and forms

{
  "evolutions": [],
  "forms": []
}

Behavior and drops

{
  "behaviour": {
    "resting": {
      "canSleep": true,
      "light": "0-4",
      "drowsyChance": 0.0333,
      "rouseChance": 0.0042
    },
    "moving": {
      "swim": {
        "canBreatheUnderwater": true,
        "swimSpeed": "0.2"
      },
      "walk": {
        "avoidsLand": true,
        "walkSpeed": 0.14
      }
    },
    "herd": {
      "maxSize": "9",
      "toleratedLeaders": [
        {
          "pokemon": "omastar",
          "tier": 1
        }
      ]
    },
    "combat": {
      "willDefendSelf": true,
      "willDefendOwner": true,
      "willFlee": false
    }
  },
  "drops": {
    "amount": 2,
    "entries": [
      {
        "item": "minecraft:nautilus_shell"
      },
      {
        "item": "minecraft:bone_meal",
        "percentage": 10
      }
    ]
  },
  "labels": [
    "gen1",
    "fossil"
  ]
}

Complete installed species record

{
  "implemented": true,
  "nationalPokedexNumber": 139,
  "name": "Omastar",
  "primaryType": "rock",
  "secondaryType": "water",
  "maleRatio": 0.875,
  "height": 10,
  "weight": 350,
  "pokedex": [
    "cobblemon.species.omastar.desc"
  ],
  "labels": [
    "gen1",
    "fossil"
  ],
  "aspects": [],
  "abilities": [
    "swiftswim",
    "shellarmor",
    "h:weakarmor"
  ],
  "eggGroups": [
    "water_1",
    "water_3"
  ],
  "baseStats": {
    "hp": 70,
    "attack": 60,
    "defence": 125,
    "special_attack": 115,
    "special_defence": 70,
    "speed": 55
  },
  "evYield": {
    "hp": 0,
    "attack": 0,
    "defence": 2,
    "special_attack": 0,
    "special_defence": 0,
    "speed": 0
  },
  "baseExperienceYield": 173,
  "experienceGroup": "medium_fast",
  "catchRate": 45,
  "eggCycles": 30,
  "baseFriendship": 50,
  "baseScale": 1,
  "hitbox": {
    "width": 0.6,
    "height": 0.7,
    "fixed": false
  },
  "behaviour": {
    "resting": {
      "canSleep": true,
      "light": "0-4",
      "drowsyChance": 0.0333,
      "rouseChance": 0.0042
    },
    "moving": {
      "swim": {
        "canBreatheUnderwater": true,
        "swimSpeed": "0.2"
      },
      "walk": {
        "avoidsLand": true,
        "walkSpeed": 0.14
      }
    },
    "herd": {
      "maxSize": "9",
      "toleratedLeaders": [
        {
          "pokemon": "omastar",
          "tier": 1
        }
      ]
    },
    "combat": {
      "willDefendSelf": true,
      "willDefendOwner": true,
      "willFlee": false
    }
  },
  "drops": {
    "amount": 2,
    "entries": [
      {
        "item": "minecraft:nautilus_shell"
      },
      {
        "item": "minecraft:bone_meal",
        "percentage": 10
      }
    ]
  },
  "moves": [
    "1:constrict",
    "1:withdraw",
    "1:bite",
    "1:rollout",
    "1:spikecannon",
    "1:tickle",
    "1:bind",
    "1:crunch",
    "1:sandattack",
    "15:watergun",
    "20:leer",
    "25:mudshot",
    "30:ancientpower",
    "35:brine",
    "43:protect",
    "49:rockblast",
    "56:surf",
    "63:shellsmash",
    "70:hydropump",
    "egg:aurorabeam",
    "egg:bide",
    "egg:bite",
    "egg:bubblebeam",
    "egg:haze",
    "egg:knockoff",
    "egg:reflecttype",
    "egg:slam",
    "egg:supersonic",
    "egg:tickle",
    "egg:waterpulse",
    "egg:wringout",
    "tm:ancientpower",
    "tm:bind",
    "tm:blizzard",
    "tm:bodyslam",
    "tm:brine",
    "tm:crunch",
    "tm:dive",
    "tm:earthpower",
    "tm:endure",
    "tm:facade",
    "tm:gigaimpact",
    "tm:gyroball",
    "tm:hail",
    "tm:haze",
    "tm:headbutt",
    "tm:hydropump",
    "tm:hyperbeam",
    "tm:icebeam",
    "tm:icywind",
    "tm:irondefense",
    "tm:knockoff",
    "tm:liquidation",
    "tm:meteorbeam",
    "tm:muddywater",
    "tm:mudshot",
    "tm:pinmissile",
    "tm:protect",
    "tm:raindance",
    "tm:rest",
    "tm:rockblast",
    "tm:rockclimb",
    "tm:rockpolish",
    "tm:rockslide",
    "tm:rocksmash",
    "tm:rocktomb",
    "tm:rollout",
    "tm:sandstorm",
    "tm:scald",
    "tm:sleeptalk",
    "tm:smackdown",
    "tm:spikes",
    "tm:stealthrock",
    "tm:stoneedge",
    "tm:substitute",
    "tm:surf",
    "tm:terablast",
    "tm:thief",
    "tm:toxicspikes",
    "tm:waterfall",
    "tm:waterpulse",
    "tm:whirlpool",
    "tutor:ancientpower",
    "tutor:bind",
    "tutor:dive",
    "tutor:earthpower",
    "tutor:gigaimpact",
    "tutor:hyperbeam",
    "tutor:icebeam",
    "tutor:icywind",
    "tutor:irondefense",
    "tutor:knockoff",
    "tutor:liquidation",
    "tutor:meteorbeam",
    "tutor:rest",
    "tutor:rockslide",
    "tutor:rocksmash",
    "tutor:rollout",
    "tutor:sleeptalk",
    "tutor:spikes",
    "tutor:stealthrock",
    "tutor:stoneedge",
    "tutor:waterpulse",
    "legacy:attract",
    "legacy:captivate",
    "legacy:confide",
    "legacy:curse",
    "legacy:doubleedge",
    "legacy:doubleteam",
    "legacy:frustration",
    "legacy:hiddenpower",
    "legacy:hornattack",
    "legacy:horndrill",
    "legacy:mimic",
    "legacy:naturalgift",
    "legacy:rage",
    "legacy:reflect",
    "legacy:return",
    "legacy:rockthrow",
    "legacy:round",
    "legacy:secretpower",
    "legacy:seismictoss",
    "legacy:skullbash",
    "legacy:snore",
    "legacy:spikecannon",
    "legacy:submission",
    "legacy:swagger",
    "legacy:takedown",
    "legacy:toxic"
  ],
  "preEvolution": "omanyte",
  "evolutions": [],
  "riding": {
    "stats": {
      "SPEED": {
        "ranges": "30-60"
      },
      "ACCELERATION": {
        "ranges": "50-100"
      },
      "SKILL": {
        "ranges": "5-10"
      },
      "JUMP": {
        "ranges": "5-10"
      },
      "STAMINA": {
        "ranges": "50-90"
      }
    },
    "seats": [],
    "behaviour": null
  }
}