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The Flash HM is on Route 2. Once you've reached Vermillion City, navigate Diglett's Cave, and you'll end up directly south of Pewter City. There is a house nearby, and you will find one of Professor Oak's aides inside. Talk to him, and he will give you HM05...assuming that you've caught at least ten Pokémon.

On a side note, you'll need a Pokémon with Cut if you want to get from there to Pewter City.

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9y ago

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