my oddish evolved at level 21 maybe around the 20s
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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.
Oddish evolves into Gloom at level 21.
You have to get an Oddish first, then evolve it into Gloom. After that you give Gloom a Leaf Stone and he will evolve into Vileplume.
Firt of all you must catch an oddish then when it evolves, it will evolve into a Gloom
Oddish evolves into Gloom at level 21.