Viridian City to Viridian Forest to Pewter City. Prof. Oak's aide gives you HM05 Flash here once you own 10 Pokemon, and the house on the route is where you trade a Clefairy for a Mr. Mime.
Spatial guide
Kanto Atlas
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Contains
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Where something is met, and how. Characters are here as well as creatures: the guide records where Professor Oak stands and where each Gym Leader is fought.