Route 5, Route 6, Route 24, Route 25, Ilex Forest, and Safari Zone (Marshland).
Chat with our AI personalities
In Ilex Forest, morning and night only.
Oddish evolves into gloom at level 21. It will evolve into bellossom by use of the sun stone. Into vileplum by leaf stone. :)
In order of how he wants to see them (based on Heart Gold and Soul Silver): Gold/Heart Gold: Oddish - Leaf Stone Growlithe - Fire Stone Pichu - Thunderstone Jigglypuff - Everstone Marill - Water Stone Silver/Soul Silver: Lickitung - Everstone Oddish - Leaf Stone Staryu - Water Stone Vulpix - Fire Stone Pichu - Thunderstone
i think it might be jumpluff hope this helped you EDIT; For my second Pokemon I had gotten Oddish, (mistaken for Jumpluff?) so I'm not sure if it completely random, but try bringing Oddish to Bill's Grandfather.
They appear at Night time.