Grimer is a PokeBonk League partner of uncommon rarity and Poison type. Its unlock challenge counts from your first run, with no League members needed. During a run it evolves into Muk (Lv. 45).
- Passive
- Takes less damage; leaves toxic puddles when hit.
- How to unlock
- Poison 20,000 Pokémon.
- League members needed
- None
- Evolution
- Grimer → Muk (Lv. 45)
Partner data comes from community testing on v0.7.7 (2026-10-20), before Season 2. The game is now on v0.8.25, so some challenges may have changed since, and we re-check them as we play.
Moves and fusions for Grimer
- Signature fusion: Sludge Tide, from Sludge + Belch at max level in Bill's Machine.
- Two maxed Poison moves fuse into Toxic Swamp, the Poison type fusion, an easy target that fits Grimer's type.
- Toxic Combustion is a reaction fusion from a Poison move and a Fire move.
Plan a build with Grimer All move fusions →
Unlock alongside Grimer
These partners' challenges count the same thing as Grimer's (Pokémon poisoned), so the same runs move all of them forward.
Other Poison partners
Bulbasaur · Weedle · Ekans · Nidoran♀ · Nidoran♂ · Zubat · Oddish · Venonat · Bellsprout · Tentacool · Gastly · Koffing
How do I unlock Grimer in PokeBonk?
Poison 20,000 Pokémon.
What type is Grimer in PokeBonk?
Poison. Takes less damage; leaves toxic puddles when hit.
When does Grimer evolve in PokeBonk?
Grimer → Muk (Lv. 45).