Grimer is a classic Poison-type that often appears early in many Pokémon journeys, but its potential is locked behind evolution. Understanding when does Grimer evolve helps trainers plan teams, level routines, and take advantage of the stronger forms available.
With the introduction of regional variants and new generations, the conditions around Grimer evolution have expanded and shifted. This guide walks through the exact triggers, stats, and strategic options for each stage so you can make the most of this slimy powerhouse.
| Form | Generation | Evolution Method | Required Level | Special Condition |
|---|---|---|---|---|
| Grimer | 1–8 (standard) | Level up | 38 | None |
| Grimer | 7–8 (Alola) | Level up | 38 | In Alola, becomes Muk at same level |
| Grimer | Sword/Shield | Level up | 38 | Galarian variant follows same level |
| Alolan Grimer | 7–8 | Level up | 38 | Evolves into Alolan Muk |
| Muk | All | No further evolution | — | Final stage in standard and regional lines |
Standard Evolution Level Requirements
Across most mainline games, Grimer follows a simple rule set for when does Grimer evolve into its next form. The baseline is a fixed level that triggers the change, with small variations based on region or version.
In Generation I and later core series titles, Grimer learns new moves and grows in power until it reaches level 38. At that point, it evolves into Muk, gaining bulk and a new movepool. Trainers who focus on grinding experience around routes and early gyms will naturally hit this threshold.
Regional Variants and Alola Conditions
The introduction of regional forms in Generation VII added a twist to when does Grimer evolve in Alola. The Alolan variant follows the same level 38 trigger, but its typing and stats shift to Poison and Dark, opening different strategic paths.
In Pokémon Sun, Moon, Ultra Sun, and Ultra Moon, trainers encounter Alolan Grimer in specific areas such as the shopping mall and certain late-game islands. Once it reaches level 38, it becomes Alolan Muk, keeping the regional theme intact while gaining new coverage options.
Competitive Builds and Move Choices
Knowing when does Grimer evolve is essential for building a competitive team around it. Muk benefits from higher Defense and Special Defense, making it a sturdy wall that can also dish out Toxic damage and trap opponents with Regenerator or similar abilities.
Trainers often plan their EV spreads and item choices around Muk’s strengths, using it as a pivot or a late-game cleaner. By understanding the evolution timing, you can time key TMs, Tutor moves, and coverage options to maximize impact in battles and tournaments.
Mechanics Behind Grimer Evolution
From a technical standpoint, Grimer evolution is triggered by a simple internal check for current level against the required threshold. No special items, friendship conditions, or time of day are needed in standard games, keeping the process straightforward.
In titles that introduce branching evolution paths, such as Sword and Shield with regional forms, the game still checks level first and then applies regional rules based on location data. This means the core when does Grimer evolve question still centers on reaching level 38, while the outcome depends on which version you are playing.
Key Takeaways for Trainers
- Grimer evolves into Muk at level 38 in most games.
- Alolan Grimer follows the same level but becomes Alolan Muk with different stats and typing.
- No items or special conditions are required beyond reaching the required level.
- Use the evolution timing to plan moves, TMs, and EV training for competitive builds.
- Muk remains the final evolution, so invest confidently in its long-term potential.
FAQ
Reader questions
Does using a Grimer evolution stone or item speed up the process?
No, Grimer evolves strictly by leveling up at level 38, and no stone or special item can force an earlier evolution in any main series game.
Can I evolve Grimer at exactly level 38 in online battles?
Yes, as soon as your Grimer reaches level 38 during or between battles, it will evolve into Muk automatically, even in competitive online matches.
Is there a difference in stats between regular Muk and Alolan Muk after evolution?
Yes, Alolan Muk trades some Defense for higher Special Defense and a Dark typing, changing its resistances and role on the team compared to standard Muk.
Will Grimer ever get a new evolution stage in future games?
As of now, Muk remains the final stage for both standard and regional Grimer, with no official plans for further evolution announced.