In the patch of grass right next to the water in the route above Cerulean City. I think it's route 24. The grassy area in the route above Vermillion City is a good bet too--Oddish are bound to show up somewhere in Kanto.
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In Ilex Forest, morning and night only.
Oddish is found normally on routes 224 and 230 but only at night.
Firt of all you must catch an oddish then when it evolves, it will evolve into a Gloom
Oddish are nocturnal, so catch one when it's past your bedtime on Route 5,6,24,25 or in Illex Forest.
catch an oddish and train it until it evolves into a gloom