I dont thin you can get in soul silver.
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TM 35: Flamethrower is located at route 28 or the Goldenrod city Game Corner for 10,000 coins.
rapidash learns flamethrower if you get the TM flamethrower and teach it
You can "purchase" a flamethrower TM in the game corner coin-tradey place.
You can get TM 25 (Flamethrower) at the Mauville Game Corner for 4000 coins.
Tm. 35