Go to the cave at the top of Dewford and as soon as you walk in there is a hiker, tak to him and he gives you it Jpg 40
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When a Pokemon has the move Flash, you go into Party, then select the Pokemon with Flash using the 'A' button and there should be an option that says "Flash". It is only usable in dark locations or within battle.
The following Pokemon that you can easily get to learn Flash in Sapphire: Beautifly or Dustox Lotad or Lombre Oddish Gloom
Find an Abra to give flash in the cave in dewford.
There is no move tutors AT ALL in Sapphire/ruby.
steven and if you talk to the men he will give flash