As soon as you enter the Volcano area, look to your left and you'll see a crater puffing out smoke. Throw pester balls into the crater and eventually a puff of smoke will come out and take the form of a koffing. Be sure to quickly take the photo once it appears.
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Koffing evolves into Wheezing, starting at level 35.
Koffing evolves at Level 35 in Pokémon Ruby.
you have to trade from firered
34-38
Koffing evolves at level at level 35 into Weezing.