to get flash, you go through diglet's tunnel, then go past the first house and cut down that tree. you will find one of those pass through places with one of Proffessor oak's aides. he will give it to you
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Get Flash from a guy a route 2 Get Flash from a guy on route 2
Flash, I believe.
Go to the rock tunnel in the east.
You cannot. Flash Cannon was not introduced until Generation IV, and Fire Red is a Generation III game...and a Generation I game.
Only the electric types. Like Abra and the ters its good for