You can obtain flash at bellsprout tower after beating the head sage or, buy it at the mall in goldenrod city on the fifith floor.
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Any Pokemon that can learn a electric move
press it and move it
You can't it is a new move in black and white only.
Do you mean what Pokemon can learn Flash? Bellsprout can, and I think Togepi can, too.
its in the goldenrod department store in the tm corner on the 5th floor