Level 35
And at episode 31 of Pokemon Indigo League
koffing evolves at level 35 and it turns into weezing and you can catch a weezing at the safari zone at the marshland area at morning and after noon olny
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Koffing evolves into Weezing at Level 35
Koffing evolves at level at level 35 into Weezing.
Koffing evolves at Level 35 in Pokémon Ruby.
Koffing evolves into Wheezing, starting at level 35.
No, try level 34-38