Koffing evolves at level at level 35 into Weezing.
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Koffing evolves into Wheezing, starting at level 35.
Koffing evolves at Level 35 in Pokémon Ruby.
Koffing evolves into Weezing at Level 35
Evolve it from larvitar at level 30 to evolve it into pupitar then evolve it into tyranitar at level 55
You have to trade him