At what level does Croagunk evolve?

Croagunk evolves into Toxicroak once it reaches level 37. Its new form retains all of the passive abilities as its previous form as well as its poison/fighting type.

Croagunk can be found in generation IV "Pokémon" games and beyond. It can be caught in the wild on Route 8 in "Pokémon White" and "Pokémon Black," as well as in both sequels, "Pokémon White 2" and "Pokémon Black 2." In "Pokémon X" and "Pokémon Y," it can be found along Route 7. Croagunk receives many substantial bonuses in its base stats once it evolves, most importantly a 45-point increase in base attack and a 35-point increase in base hit points.