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First you need to catch at least 10 different pokemon (if you catch 1 and evolve it, this will count as 2). Next you need to use cut after Diglett's cave. On route 2, there is a small house with one of Prof. Oak's aides inside. Talk to him, and he'll give you HM with flash in it. Teach this to a pokemon and you'll be able to use flash.

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13y ago

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