In SoulSilver, Oddish will evolve into Gloom at Level 21 however Gloom can evolve 2 different ways, you can use a Leaf Stone on it in order for it to evolve into Vileplume or you can use a Sun Stone on it in order for it to evolve into Bellossom.
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Oddish evolves into gloom at level 21. It will evolve into bellossom by use of the sun stone. Into vileplum by leaf stone. :)
Oddish evolves into Gloom at level 21.
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.
my oddish evolved at level 21 maybe around the 20s
Oddish evolves into Gloom at level 21.