You have to breed a Weezing, you can catch it at Route 227 or at Stark Mountain.
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Koffing evolves into Weezing at Level 35
Koffing evolves into Wheezing, starting at level 35.
i asked my friend and he said you can get him in fiery path beside mout.chimney
Koffing evolves at Level 35 in Pokémon Ruby.
Koffing evolves at level at level 35 into Weezing.