Is Grimer Good in Ruby & Sapphire Playthrough?
Fiery Path in Hoenn, native to RS. AbilityStench reduces wild encounters. Muk evolves at 38 with high HP and solid physical stats. Poison typing doesn't threaten Hoenn's gyms directly, but the bulk helps against Sidney and physical attackers.
Roxanne's typing presses Grimer's defenses.
Grimer trades roughly evenly with Brawly's team.
Wattson's typing presses Grimer's defenses.
Grimer trades roughly evenly with Flannery's team.
Norman's typing presses Grimer's defenses.
Grimer trades roughly evenly with Winona's team.
Tate & Liza's team hits Muk's weaknesses hard.
Muk trades roughly evenly with Wallace's team.
Muk has the type edge here and should clean up Sidney's team.
Phoebe's team hits Muk's weaknesses hard.
Muk has the type edge here and should clean up Glacia's team.
Muk trades roughly evenly with Drake's team.
Steven's team hits Muk's weaknesses hard.
Catchable
Catch Grimer in Fiery Path (walking, Lv 14, rare).
Recommended Moves
- STARTING (Lv 14)
- LV 14PoisonSludgePower 98Accuracy 100%PP 20
- After Brawly
- TM35FireFlamethrowerPower 95Accuracy 100%PP 15Mauville Game Corner
- TM24ElectricThunderboltPower 95Accuracy 100%PP 15Mauville Game Corner
- After Wattson
- TM43NormalSecret PowerPower 70Accuracy 100%PP 20Route 111
- After Norman
- TM38FireFire BlastPower 120Accuracy 85%PP 5Lilycove Department Store
- TM25ElectricThunderPower 120Accuracy 70%PP 10Lilycove Department Store
- TM42NormalFacadePower 70Accuracy 100%PP 20Prize for defeating Norman
- LV 43PoisonSludge BombPower 135Accuracy 100%PP 10
Evolve Grimer to Muk
Grimer evolves into Muk at Level 38. Your Grimer should hit Level 38 before you reach Tate & Liza, at typical leveling pace.
Recommended Moves
- STARTING (Lv 38)
- LV 38PoisonSludgePower 98Accuracy 100%PP 20
- After Brawly
- TM35FireFlamethrowerPower 95Accuracy 100%PP 15Mauville Game Corner
- TM24ElectricThunderboltPower 95Accuracy 100%PP 15Mauville Game Corner
- After Norman
- TM01FightingFocus PunchPower 150Accuracy 100%PP 20Route 115
- TM15NormalHyper BeamPower 150Accuracy 90%PP 5Lilycove Department Store
- TM38FireFire BlastPower 120Accuracy 85%PP 5Lilycove Department Store
- TM25ElectricThunderPower 120Accuracy 70%PP 10Lilycove Department Store
- LV 47PoisonSludge BombPower 135Accuracy 100%PP 10
How to Get Grimer in Ruby & Sapphire
Grimer lurks in the Fiery Path, and the two versions split on it: Ruby makes it a rare level-14 find, while Sapphire has it common in the mid teens. That single cave is its only home.
Wild Grimer may be holding when caught:
Nugget (5% chance) A nugget of pure gold. Can be sold at a high price.1 location to catch Grimer
Encountered via tall grass encounters
Badge 3Where To Catch Grimer in RS
- Step 2Evolve into MukBREEDINGAvailableLeave a compatible parent at the Pokemon Day Care to receive a Grimer egg.
To plan your throws, open the Ruby & Sapphire catch rate calculator with Grimer preloaded.
How to Get Shiny Grimer in Ruby & Sapphire
Grimer lurks in the Fiery Path, so wander its floors and check every wild one you turn up for a shiny sheen. Compare Shiny Grimer odds across every game
Ruby & Sapphire Shiny Grimer Calculator
2 MethodsBoth methods here share the same odds, about 1 in 8,192 on each try. Pick whichever fits how you play.
Full Odds: Walk through grass, surf, or fish. Every encounter is its own independent shiny roll.
Breeding: Hatch eggs of this line; each egg rolls at the base shiny rate (no Masuda before Gen IV).
How many you have done, or plan to do.
| Chance | Encounters | Time |
|---|---|---|
| 10%lucky few | 864-- | -- |
| 25%one in four | 2,357-- | -- |
| 50%coin flip | 5,678-- | -- |
| 90%very likely | 18,862-- | -- |
Time assumes -- at your pace and does not change your shiny odds.
How is this calculated?
Every encounter has the same shiny chance, the Shiny Odds Per Try shown above. Each one is a separate roll that does not care how many you have already done, so the more you hunt, the higher your overall chance of at least one shiny. The formula below turns your odds and your number of tries into that combined chance.
chance after N tries = 1 − (1 − p)^N, where p = 1 / odds per try
Example at 1 in 8,192 (classic full odds): about 864 encounters for a 10 percent chance, 5,678 for 50 percent, and 18,862 for 90 percent.
The table above flips that around: it shows how many encounters it takes to reach a 10, 25, 50, and 90 percent chance at your current odds. Turning on boosts like the Shiny Charm, sandwiches, or chains improves your odds, so the encounter numbers drop.
These are estimates, not promises. Most games have no pity counter, meaning no guaranteed shiny no matter how many you hunt, so even Very Likely is not guaranteed: some hunters find one early, others go well past that point.
For time estimates and charm math, open the Ruby & Sapphire shiny odds calculator with Grimer already selected.
Grimer Weakness
Grimer is weak to Ground and Psychic. 4 resistances help offset the weaknesses. Just 2 weak spots to worry about, which keeps teambuilding straightforward.
| Damage | Types |
|---|---|
| 2x (Weak) | Ground, Psychic |
| 0.5x (Resist) | Grass, Fighting, Poison, Bug |
- Dark and Steel types added — Fairy does not exist yet
- Moves are Physical or Special based on type, not per move
What is Grimer Weak Against
AvgBest Pokemon Against Grimer
 Kadabra Psychic | C | |
 Graveler RockGround | C | |
 Sandslash Ground | A | |
 Kirlia Psychic | D | |
 Marshtomp WaterGround | C | |
Obtain MethodEvolve Mudkip (Route 101 Gift) | ||
 Spoink Psychic | C | |
 Trapinch Ground | C | |
 Baltoy GroundPsychic | D | |
Available Moves Moves
Damage vs Grimer View Baltoy builds →Psychic 2x62-73% Dig 2x42-49% | ||
 Numel FireGround | C | |
 Nincada BugGround | C | |
Grimer Evolutions
One evolution ahead. Grimer grows into Muk through a straightforward two-stage chain. A decent partner pool for breeding via one egg group. Eggs take an average time to hatch. Evolving adds up to 175 stat points total. View every chain in the Evolution Chart.
How to Evolve
Breeding
Breed Grimer easily with 22 breeding partners from the Amorphous egg group. Pass egg moves like Curse, Explosion, Haze and 4 more to offspring.
RS Grimer Best Moveset
Poison pre-evolution stats can't compete. AbilitySticky Hold prevents item removal and AbilityStench occasionally discourages attacks. Muk improves with better Attack and bulk.
Best Build
Grimer best EVs are HP and Sp. Def
Wall Moveset
- Toxic
- Sludge Bomb
- Dig
- Acid Armor
Recommended Teammates
Moves List
Breeding opens up real options for Grimer. Curse and Explosion come exclusively from egg moves, and they're worth the effort. The rest of the kit covers basics through Sludge Bomb and Sludge and coverage across 8 types.
How to Read the Moves Table
Tabs
- Level-Up
- Learned by leveling up.
- TM
- Taught by a Technical Machine.
- Egg
- Inherited via breeding.
- 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. That triggers abilities like Static, Flame Body, Rough Skin, or Iron Barbs, plus items like Rocky Helmet and Sticky Barb.
Tier (S to D)
Each move's competitive rank in RankedBoost's system. TM, Egg, 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, Egg, 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 24 TMs are obtainable before the Elite Four
Egg Moves
Tutor Moves
Base Stats
GRIMER’s sludgy and rubbery body can be forced through any opening, however small it may be. This POKéMON enters sewer pipes to drink filthy wastewater.
GRIMER emerged from the sludge that settled on a polluted seabed. This POKéMON loves anything filthy. It constantly leaks a horribly germ-infested fluid from all over its body.
Grimer Ruby & Sapphire Guide
Yes. Wild Grimer in Ruby & Sapphire can hold Nugget (5%). Use Thief (TM46) or Covet to swipe the held item without affecting your catch chance. Quickest way to farm rare items like Nugget.
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.
Keep playing · Ruby & SapphireRuby & Sapphire Tier ListThe best Pokemon ranked tier by tierSee Ruby & Sapphire Tier List