he evolves into gloom starting at level 21
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In all of the Pokemon games Oddish evolves to Gloom when it is level 21, then you can evolve it into Bellossom with the sun stone or Vileplume with the leaf stone.
get it to l.21
Oddish is a FireRed-exclusive Pokemon in Generation III. To obtain an Oddish in LeafGreen, it has to be traded.Oddish is a FireRed-exclusive Pokemon in Generation III. To obtain an Oddish in LeafGreen, it has to be traded.Oddish does not appear in LeafGreen.
Evolve an Oddish to Gloom then use a Sun Stone to further evolve it to Bellossom. You must have the National Pokedex upgrade in order to evolve it otherwise nothing will happen.
trade it