Koffing 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 Weezing (Lv. 43).
- Passive
- Levitates and climbs walls; leaves a poison gas cloud.
- How to unlock
- Trigger 5,000 elemental reactions.
- League members needed
- None
- Evolution
- Koffing → Weezing (Lv. 43)
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 Koffing
- Signature fusion: Detonating Cloud, from Smog + Explosion at max level in Bill's Machine.
- Two maxed Poison moves fuse into Toxic Swamp, the Poison type fusion, an easy target that fits Koffing's type.
- Toxic Combustion is a reaction fusion from a Poison move and a Fire move.
Plan a build with Koffing All move fusions →
Unlock alongside Koffing
These partners' challenges count the same thing as Koffing's (elemental reactions), so the same runs move all of them forward.
- Gastly: Trigger 600 elemental reactions in a single run.
- Porygon: Trigger 1,200 elemental reactions in a single run.
Other Poison partners
Bulbasaur · Weedle · Ekans · Nidoran♀ · Nidoran♂ · Zubat · Oddish · Venonat · Bellsprout · Tentacool · Grimer · Gastly
How do I unlock Koffing in PokeBonk?
Trigger 5,000 elemental reactions.
What type is Koffing in PokeBonk?
Poison. Levitates and climbs walls; leaves a poison gas cloud.
When does Koffing evolve in PokeBonk?
Koffing → Weezing (Lv. 43).