You need Gloom (evolve from Oddish at lv21), give it Sun Stone (from someone at Lilycove City, at Space Center)
It'll evolve into Bellosom. I love Bellosom, it's beautiful+cute, as same as me! xD
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Bellossom can be obtained by evolving a gloom with a sunstone.
Roselia, Bellossom or Sceptile.
Raise an oddish to evolve to gloom, or catch a gloom in the safari zone, then evolve it with a sun stone. You should get bellossom.
To evolve certain pokemon. Eg a gloom into a bellossom
gloom evolves into a vileplume with a leaf stone and into bellossom with a sun stone