In the pokewalker routes, and definitely Ilex Forest to name a few areas.
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Oddish evolves at level 21 in HeartGold.
Oddish are commonly found on Routes 5, 6, 24, 25, Ilex Forest and in the Safari Zone at night.
Oddish are nocturnal, so catch one when it's past your bedtime on Route 5,6,24,25 or in Illex Forest.
an oddish can learn cut in pkmn hg version
You find Oddish on: Route 5, Route 6, Route 24, Route 25, Ilex Forest Safari Zone