Grimer is a classic Poison-type from Kanto that often confuses Trainers about when does Grimer evolve. Understanding its evolution requirements and timing helps you plan team building and avoid wasting items.
This guide breaks down level thresholds, item usage in later games, and regional forms so you can evolve Grimer at the right moment. The tables and FAQs below clarify common doubts and edge cases.
| Game | Evolution Method | Minimum Level | Special Conditions |
|---|---|---|---|
| Red / Blue / Yellow | Level Up | 38 | None |
| Gold / Silver / Crystal | Level Up | 38 | None |
| Ruby / Sapphire / Emerald | Level Up | 38 | None |
| Diamond / Pearl / Platinum | Level Up | 38 | None |
| Sword / Shield | Level Up | 38 | Carkol trade evolution in BDSP |
| Sun / Moon / Ultra Sun / Ultra Moon | Level Up | 38 | Alolan Grimer introduced |
| X / Y | Level Up | 38 | None |
| Let's Go Pikachu / Eevee | Level Up | 38 | Kantonian only |
Standard Evolution Requirements
Level Thresholds Across Generations
In nearly every main series game, Grimer evolves into Muk at level 38. This applies to Kantonian Grimer from Red Blue Yellow onward, with very few exceptions in spin-off titles. Grinding to level 38 is usually enough if you are using a standard Kantonian Grimer.
How Items and Moves Can Mislead Players
Some fans wonder whether trading an item or using a specific move triggers evolution. Outside of games like Sword and Shield where an NPC trade involving a Carkol appears in the wilderness areas, items and moves never force Grimer to evolve. Level 38 remains the consistent gate for the standard evolution.
Alolan Grimer Specifics
Regional Form Evolution Details
Alolan Grimer, introduced in Sun Moon and later games, also evolves into Alolan Muk at level 38. The typing changes to Poison/Dark, but the level requirement does not differ from the original line. Location and encounter method vary, but the evolution threshold is identical.
Unique Traits and Battle Implications
Alolan Muk gains the Beast Boost ability, which can raise its highest stat after a knockout. If you are pursuing a special or competitive build, evolving at level 38 still applies, so plan training around that level benchmark.
Special Cases and Exceptions
Sword and Shield Trade Evolution Variant
In the Wild Area and certain raids, players may encounter a different method where a Grimer interacting with a Carkol in a trade-like event triggers evolution. This is an NPC-driven shortcut in specific Sword and Shield setups, but the underlying rule still centers on reaching the necessary level first.
Event Moves and Cosmetic Changes
Event distributions sometimes give Grimer special moves or costumes, but these do not affect when Grimer evolves. The level 38 threshold remains unchanged regardless of held items, hidden abilities, or festive skins.
Key Takeaways for Trainers
- Grimer evolves into Muk at level 38 in most main series games.
- Alolan Grimer follows the same level 38 evolution rule with a different typing.
- Items, moves, and cosmetic forms never replace the level requirement.
- Sword and Shield include a unique NPC trade evolution that still respects level thresholds.
- Plan training and resource allocation around the level 38 milestone to avoid wasted effort.
FAQ
Reader questions
Does Grimer evolve at a different level in any game?
No, the standard evolution occurs at level 38 in almost every main series title. Some spin-offs may differ, but core RPG games consistently use level 38.
Can I evolve Grimer earlier using a stone or item?
Items like a Moon Stone or Fire Stone do not affect Grimer. Only reaching level 38 or triggering the specific trade scenario in Sword and Shield will cause it to evolve.
Is Alolan Grimer harder to evolve than regular Grimer?
No, Alolan Grimer also evolves at level 38. The difference is in where and how you obtain it, not the level requirement.
Does trading affect when Grimer evolves in modern games?
In most games, trading does nothing. In Sword and Shield, a special NPC trade with a Carkol can trigger evolution, but your Grimer still needs to meet level requirements beforehand.