
Is Grimer Good in Yellow Playthrough?
Slow and limited offensively. Grimer doesn't offer much at this stage, and even Muk can't overcome the fundamental problem that Poison doesn't threaten anything important in Gen 1.
Brock's typing presses Grimer's defenses.
Misty's typing presses Grimer's defenses.
Lt. Surge's typing presses Grimer's defenses.
Erika's typing presses Grimer's defenses.
Grimer trades roughly evenly with Koga's team.
Grimer trades roughly evenly with Sabrina's team.
Muk trades roughly evenly with Blaine's team.
Giovanni's team hits Muk's weaknesses hard.
Muk trades roughly evenly with Lorelei's team.
Muk trades roughly evenly with Bruno's team.
Agatha's team hits Muk's weaknesses hard.
Muk trades roughly evenly with Lance's team.
Muk trades roughly evenly with Blue's team.
Catchable
Catch Grimer in the Pokémon Mansion (walking, Lv 23-26, uncommon).
Recommended Moves
- After Misty
- TM08NormalBody SlamPower 85Accuracy 100%PP 15S.S. Anne
- After Lt. Surge
- TM24ElectricThunderboltPower 95Accuracy 100%PP 15Prize for defeating Vermilion Gym Leader Lt. Surge
- After Erika
- TM21GrassMega DrainPower 40Accuracy 100%PP 10Prize for defeating Celadon Gym Leader Erika
- LV 37PoisonSludgePower 98Accuracy 100%PP 20
- After Koga
- TM36NormalSelf-DestructPower 130Accuracy 100%PP 5Silph Co.
- TM25ElectricThunderPower 120Accuracy 70%PP 10Kanto Power Plant
- After Blaine
- TM38FireFire BlastPower 120Accuracy 85%PP 5Prize for defeating Cinnabar Gym Leader Blaine
- After Giovanni
- TM47NormalExplosionPower 170Accuracy 100%PP 5Victory Road 3F
Evolve Grimer to Muk
Grimer evolves into Muk at Level 38. Your Grimer should hit Level 38 before you reach Blaine, at typical leveling pace.
Recommended Moves
- STARTING (Lv 38)
- LV 38PoisonSludgePower 98Accuracy 100%PP 20
- After Misty
- TM08NormalBody SlamPower 85Accuracy 100%PP 15S.S. Anne
- After Lt. Surge
- TM15NormalHyper BeamPower 150Accuracy 90%PP 5Rocket Game Corner
- TM24ElectricThunderboltPower 95Accuracy 100%PP 15Prize for defeating Vermilion Gym Leader Lt. Surge
- After Koga
- TM36NormalSelf-DestructPower 130Accuracy 100%PP 5Silph Co.
- TM25ElectricThunderPower 120Accuracy 70%PP 10Kanto Power Plant
- After Blaine
- TM38FireFire BlastPower 120Accuracy 85%PP 5Prize for defeating Cinnabar Gym Leader Blaine
- After Giovanni
- TM47NormalExplosionPower 170Accuracy 100%PP 5Victory Road 3F
How to Get Grimer in Yellow
Grimer oozes across 5 spots in two areas, common to uncommon, levels 23 to 38. Plenty of chances, so grab the first one you trip over.
2 locations to catch Grimer
Encountered via tall grass encounters
Where To Catch Grimer in Y
Grimer is the chain's first catch. You'll find walking and trade encounters from Lv. 23-41 across 10 total spots in the chain.
To plan your throws, open the Yellow catch rate calculator with Grimer preloaded.
Grimer Weakness
Grimer is weak to Ground, Psychic, and Bug. Standard number of weaknesses for the Poison typing.
| Damage | Types |
|---|---|
| 2x (Weak) | Ground, Psychic, Bug |
| 0.5x (Resist) | Grass, Fighting, Poison |
- 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
What is Grimer Weak Against
VulnerableBest Pokemon Against Grimer
Rhydon GroundRock | S | |
Sandslash Ground | C | |
Nidoking PoisonGround | C | |
Graveler RockGround | C | |
Nidoqueen PoisonGround | C | |
Hypno Psychic | C | |
Exeggutor GrassPsychic | S | |
Kadabra Psychic | B | |
Available Moves Moves
Damage vs Grimer View Kadabra builds →Psychic 2x154-182%KO Dig 2x39-46% | ||
Marowak Ground | C | |
Dugtrio Ground | B | |
Parasect BugGrass | C | |
Available Moves Moves
Damage vs Grimer View Parasect builds →Dig 2x81-95% Leech Life 2x26-31% | ||
Slowbro WaterPsychic | B | |
Obtain MethodRoute 12 Surfing Available Moves Moves
Damage vs Grimer View Slowbro builds →Psychic 2x133-157%KO Earthquake 2x66-79% | ||
Onix RockGround | C | |
Venomoth BugPoison | C | |
Available Moves Moves
Damage vs Grimer View Venomoth builds →Psychic 2x81-95% Leech Life 2x19-23% | ||
Grimer Evolutions
Grimer evolves into Muk, but can't breed. At 315 stats as a Poison type, evolution is the only path. Evolving adds up to 185 stat points total. View every chain in the Evolution Chart.
How to Evolve
Y Grimer Best Moveset
Poison stats across the board with no offensive type value. MoveBody Slam is the best damage option because Poison attacks don't threaten anything competitively relevant. Muk inherits the same type problems with better bulk.
Best Build
Utility Moveset
- Harden
- Toxic
- Mimic
- Disable
Recommended Teammates
Moves List
TMs carry this one. Grimer learns Sludge naturally for STAB, but the offensive range comes almost entirely from technical machines. Normal and Fire and beyond give it real matchup play.
How to Read the Moves Table
Tabs
- Level-Up
- Learned by leveling up.
- TM
- Taught by a Technical Machine.
- Tutor
- NPC tutor (cost: items, BP, money).
- Reminder
- An NPC reteaches any move this Pokemon could have learned by leveling up.
- Transfer
- Carried over from an older game using Pokemon HOME.
- Event
- Given out through Mystery Gift events.
Visual Signals
CAT (Category)
How the move deals damage and which stats it uses.
A small dot on the icon's corner marks the move as contact.
Tier (S to D)
Each move's competitive rank in RankedBoost's system. TM and Tutor sort by tier by default (best first). On Level-Up, click the Tier header to do the same.
PWR (Power)
Base damage. Numbers shown in a type color include STAB (base × 1.5). Hover any colored number to see the math.
— means no power (status moves) or variable power.
Sorting & Filter
Click any column header to sort. Level-Up opens with Lv 1 at the top. TM and Tutor open with the highest-tier moves at the top.
Search filters by move name or type. The Filter button limits the list to STAB, Physical, Special, or Status moves.
Level-Up Moves
TM Moves
All 14 TMs are obtainable before the Elite Four
Tutor Moves
Base Stats
Made of hardened sludge. It smells too putrid to touch. Even weeds won’t grow in its path.
Grimer Yellow Guide
For Yellow, you can run Grimer through the first few routes without issues. 315 BST won't carry you far though. Get it to Muk as fast as you can.
Yes. Alolan Grimer is a regional variant with different typing and a reworked stat spread. Introduced in Gen 7. Plays completely differently from the original.
Game Availability
Since debuting in Red & Blue, Grimer has appeared in 19 titles over 9 generations. Along the way, it received an Alolan form in Generation 7, keeping it relevant across different competitive metas.
Click a game to view version-specific details
- Gen 1RBDebut

Red & Blue - Gen 1Y
Yellow - Gen 2GS

Gold & Silver - Gen 2C
Crystal - Gen 3RS

Ruby & Sapphire - Gen 3E
Emerald - Gen 3FRLG

FireRed & LeafGreen - Gen 4DP

Diamond & Pearl - Gen 4Pt
Platinum - Gen 4HGSS

HeartGold & SoulSilver - Gen 5BW

Black & White - Gen 5B2W2

Black 2 & White 2 - Gen 6XY

X & Y - Gen 6ORAS

Omega Ruby & Alpha Sapphire - Gen 7SMAlolan

Sun & Moon - Gen 7USUM

Ultra Sun & Ultra Moon - Gen 7Let's Go

Let's Go Pikachu & Eevee - Gen 8SwSh

Sword & Shield - Gen 8BDSP

Brilliant Diamond & Shining Pearl - Gen 8PLA
Legends: Arceus - Gen 9SV

Scarlet & Violet - Gen 9LZA
Legends: Z-A - Gen 10WW

Winds & Waves
Explore
Where to go next after Grimer.