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You'll need to give it a Leaf Stone to evolve it into Vileplume or use a Sun Stone to evolve it into Bellossum.
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.
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.
gloom evolves into a vileplume with a leaf stone and into bellossom with a sun stone
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.