Find an Abra to give flash in the cave in dewford.
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The following Pokemon that you can easily get to learn Flash in Sapphire: Beautifly or Dustox Lotad or Lombre Oddish Gloom
Of the seven pokemon available in Granite Cave, the cave northwest of Dewford Town, only Abra and Sableye can learn HM05 Flash.
Nincada is a fantastic Pokemon to use these moves on. Not only can it learn Flash and Rock Smash, but also Cut, Dig, and Secret Power which are all moves that are required later on.
all the Pokemon on dimmond that can learn flash can still learn flash in the platinum game too
In Pokemon diamond many Pokemon can learn flash for eg. Electric Pokemon such as Pachurisu Pichu and Luxray all (eveloutions) and yeah just experiment and see what can learn flash!