Get Flash from a guy a route 2 Get Flash from a guy on route 2
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use the move Flash (TM70)
yes trade with a friend
You blow on the dsi, i'm not sure if a ds can recognize wind on pokemon diamond or not.
You need the Silph Scope to see it, then defeat it.
You have to go to the next city and beat the team rocker hideout which is in the Game Corner.