Skip to content

#0088 Grimer

Grimer artwork
Artwork: PokéAPI.
Poison
Abilities
StenchDamaging moves used in battle have a 20% chance to make the target flinch; this can stack with King’s Rock and move effects.Sticky HoldPrevents the loss of its held item.
Hidden ability
Poison TouchContact with the Pokémon may poison the foe.
Capture
Gender
50.0% female
Egg groups
Amorphous
Growth
Medium Fast
EV yield
1 HP
Wild held item
Black Sludge
Grimer’s base stats
HP80
Attack80
Defense50
Sp. Atk40
Sp. Def50
Speed25
Total325

Where to find it

Chance per encounter, under the conditions shown.

Times and conditions
  • Morning: 4:00–9:59
  • Day: 10:00–19:59
  • Night: 20:00–3:59

Calendar encounters can replace a land slot on specific dates.

Safari candidates depend on the selected area and time. Object Arrangement does not unlock in this hack; bonus block encounters are excluded.

Where to find Grimer in the wild
LocationMethod / conditionsLevelChance
Route 10, and 1610%
Route 10, 1610%
Power Plant, 3220%
Power Plant, 3220%
Pokémon Tower, upper floors, and 261%
Route 16 East, 26–2820%
Route 16 East, 26–2820%
Route 16 East, 2810%
Route 18, 2620%
Route 18, 2620%
Route 18, 26–2750%
Dark Cave Route 31 Side, 3220%
Dark Cave Route 31 Side, 3220%
Safari Zone: Marshland: Marshland area selected, , and 17Not fixed
Safari Zone: Marshland: Marshland area selected, , 15Not fixed
Safari Zone: Marshland: Marshland area selected, , 16Not fixed
Safari Zone: Marshland: Marshland area selected, , 17Not fixed

Safari Zone: choose the listed area. Area selection unlocks during Baoba’s Sandshrew test, after his Geodude test. Object Arrangement never unlocks in this hack, so block-dependent bonus encounters are excluded. The listed candidates do not have a verified encounter percentage.

Evolution

Evolves into Muk at Lv 38.

Level-up moves

“On evolution” moves are learned when this Pokémon evolves. Open a move for its full effects and any special behavior in this hack.

Grimer’s level-up moves
LevelMoveTypeCategoryPowerAccuracyPPEffect and notes
1PoundNormalPhysical4010035The foe is physically pounded with a long tail or a foreleg, etc.
1Poison GasPoisonStatus—9040A cloud of poison gas is sprayed in the foe’s face. It may poison the target.
4HardenNormalStatus——30The user stiffens all the muscles in its body. Raises its Defense by 1 stage.
7Mud-SlapGroundSpecial2010010The user hurls mud in the foe’s face to inflict damage. Lowers its accuracy by 1 stage.
12DisableNormalStatus—10020For several turns, this move prevents the foe from using the move it last used.
15SludgePoisonSpecial6510020Unsanitary sludge is hurled at the foe. It has a 30% chance to poison the target.
18SmogPoisonSpecial307020The foe is attacked with a discharge of filthy gases. 40% chance to poison the target.
21MinimizeNormalStatus——10The user compresses its body to look smaller. Raises its evasiveness by 1 stage.
26FlingDarkPhysicalvar.10010The user flings its held item at the foe to attack. Its power and effects depend on the item.
29Sludge BombPoisonSpecial9010010The user hurls filthy sludge at the foe. It has a 30% chance to poison the target.
32Sludge WavePoisonSpecial9510010A wave of sludge hits all Pokémon around the user. It may poison them.
37ScreechNormalStatus—8540An earsplitting screech is emitted to lower the foe’s Defense by 2 stages.
40Gunk ShotPoisonPhysical120905Slams the target with filthy garbage. Has a 30% chance to poison the target.
43Acid ArmorPoisonStatus——20The user alters its cellular structure to liquefy itself. Raises its Defense by 2 stages.
46BelchPoisonSpecial1209010The user belches at the foe to deal damage. It can’t be used unless the user has eaten a Berry.
48MementoDarkStatus—10010The user sacrifices its own life. In return, it lowers the target’s Attack and Sp. Atk by 2 stages.

TMs and HMs

TMs and HMs Grimer can learn
TM / HMMoveTypeCategoryPowerAccuracyPPEffect and notes
TM10Hidden PowerNormalSpecial6010015A unique attack that varies in type and intensity depending on the Pokémon using it.
TM11Sunny DayFireStatus——5The user intensifies the sun for 5 turns. Fire-type moves become 1.5 times stronger.
TM12TauntDarkStatus—10020The foe is taunted into a rage that allows it to use only attack moves for 2 to 4 turns.
TM17ProtectNormalStatus——10It enables the user to evade all attacks for 1 turn. Its chance of failing rises if used in succession.
TM18Rain DanceWaterStatus——5The user summons a heavy rain for 5 turns. Water-type moves become 1.5 times stronger.
TM19Giga DrainGrassSpecial7510010A nutrient-draining attack. The user’s HP is restored by half the damage taken by the target.
TM21FrustrationNormalPhysicalvar.10020A full-power attack that grows more powerful the less the user likes its Trainer.
TM24ThunderboltElectricSpecial9010015A strong electric blast is loosed at the foe. It has a 10% chance to paralyze the target.
TM25ThunderElectricSpecial1107010A wicked thunderbolt strikes the foe. It is more accurate in rain. 30% chance to paralyze the target.
TM27ReturnNormalPhysicalvar.10020A full-power attack that grows more powerful the more the user likes its Trainer.
TM28DigGroundPhysical8010010The user burrows on turn 1, then attacks on turn 2. It can also be used to exit caves.
TM30Shadow BallGhostSpecial8010015The user hurls a shadowy blob at the foe. 20% chance to lower its Sp. Def by 1 stage.
TM32Double TeamNormalStatus——15By moving rapidly, the user makes illusory copies of itself. Raises its evasiveness by 1 stage.
TM34Shock WaveElectricSpecial60—20The user strikes the foe with a quick jolt of electricity. This attack cannot be evaded.
TM35FlamethrowerFireSpecial9010015The foe is scorched with an intense blast of fire. It has a 10% chance to burn the target.
TM36Sludge BombPoisonSpecial9010010The user hurls filthy sludge at the foe. It has a 30% chance to poison the target.
TM38Fire BlastFireSpecial110855The foe is hit by an intense blast of all-consuming fire. It has a 10% chance to burn the target.
TM39Rock TombRockPhysical609515Boulders are hurled at the foe, hindering its movement. Lowers its Speed by 1 stage.
TM41TormentDarkStatus—10015The user torments and enrages the foe, making it incapable of using the same move twice in a row.
TM42FacadeNormalPhysical7010020An attack whose power is 2 times higher if the user is poisoned, burned, or paralyzed.
TM44RestPsychicStatus——5The user goes to sleep for 2 turns. It fully restores the user’s HP and heals any status problem.
TM45AttractNormalStatus—10015The user charms a foe of the opposite gender. The foe has a 50% chance of being unable to act.
TM46ThiefDarkPhysical6010025The user attacks and steals the foe’s held item simultaneously. It can’t steal if the user holds an item.
TM56FlingDarkPhysicalvar.10010The user flings its held item at the foe to attack. Its power and effects depend on the item.
TM58EndureNormalStatus——10The user endures any attack with at least 1 HP. Its chance of failing rises if it is used in succession.
TM64ExplosionNormalPhysical2501005A huge explosion hits all Pokémon in battle, and the user faints. The targets’ Defense is halved.
TM66PaybackDarkPhysical5010010The user charges up, then attacks. If it moves after the foe, its power is doubled.
TM80Rock SlideRockPhysical759010Large boulders are hurled at the foe. It has a 30% chance to make the target flinch.
TM82Sleep TalkNormalStatus——10While it is asleep, the user randomly uses one of the moves it knows.
TM84Poison JabPoisonPhysical8010020The foe is stabbed with a poison tentacle. It has a 30% chance to poison the foe.
TM87SwaggerNormalStatus—8515The user enrages the foe into confusion. However, it also raises the foe’s Attack by 2 stages.
TM90SubstituteNormalStatus——10The user makes a copy of itself using 1/4 of its HP. The copy serves as the user’s decoy.
TM94VenoshockPoisonSpecial6510010Sprays the target with toxic fluid. Power doubles if the target is poisoned.
HM04StrengthNormalPhysical8010015The foe is slugged with a punch thrown at maximum power. It can also be used to move boulders.

Move tutors

Moves Grimer can learn from tutors
MoveTypeCategoryPowerAccuracyPPEffect and notesTutor location, cost and requirements
CurseGhostStatus——10Curses the foe. Non- Ghost types raise Attack and Defense by 1 stage and lower Speed by 1 stage.

Pokémon Tower, upper floors · Cost: Free

Requirements: Pokémon Tower: side battles and extras

the little girl in the Pokémon Tower, Lavender Town

Fire PunchFirePhysical7510015The foe is punched with a fiery fist. It has a 10% chance to burn the target.
HazeIceStatus——30The user creates a haze that eliminates every stat change among all the Pokémon engaged in battle.
Ice PunchIcePhysical7510015The foe is punched with an icy fist. It has a 10% chance to freeze the target.

Celadon Pokémon Center · Cost: Friend Ball ×1

Celadon City Pokémon Center

SnarlDarkSpecial559515The user yells at the foe relentlessly, lowering its Sp. Atk.
Thunder PunchElectricPhysical7510015The foe is punched with an electrified fist. It has a 10% chance to paralyze the target.

Egg moves

Grimer’s egg moves
MoveTypeCategoryPowerAccuracyPPEffect and notes
Acid SprayPoisonSpecial4010020Sprays a corrosive liquid that greatly lowers the target’s Special Defense.
CurseGhostStatus——10Curses the foe. Non- Ghost types raise Attack and Defense by 1 stage and lower Speed by 1 stage.
HazeIceStatus——30The user creates a haze that eliminates every stat change among all the Pokémon engaged in battle.
ImprisonPsychicStatus——10If the foe knows any move also known by the user, the foe is prevented from using it.
LickGhostPhysical3010030The foe is licked with a long tongue. It has a 30% chance to paralyze the target.
Mean LookNormalStatus——5The user affixes the foe with a dark, arresting look. The target becomes unable to flee.
Power-Up PunchFightingPhysical4010020Hitting the foe again and again hardens the user’s fists. Each hit raises its Attack.
Scary FaceNormalStatus—10010The user frightens the foe with a scary face. Lowers its Speed by 2 stages.
Shadow PunchGhostPhysical60—20The user throws a punch at the foe from the shadows. The punch lands without fail.
Shadow SneakGhostPhysical4010030The user extends its shadow and attacks the foe from behind. This move always goes first.
Spit UpNormalSpecialvar.10010Attacks with stored power. The more it has stored, the greater the power.
StockpileNormalStatus——20The user charges up power, raising its Defense and Sp. Def. It can be used up to 3 times.
SwallowNormalStatus——10Heals HP with stored power. The more it has stored, the more HP it restores.

The official site of the Origin HeartGold English translation. Patches are published only on our GitHub releases.

A free, non-commercial fan project. Not affiliated with or endorsed by Nintendo, Creatures Inc., GAME FREAK inc. or The Pokémon Company.

© 2026 Origin HeartGold English translation team. Guide text: all rights reserved — see licence.