you can get TM flametrower thunderbolt and ice beam in pokemon crystal at the game corner. On Wednesday and Saturday there will be a fat man outside the game corner who will give you TM flamethower thunderbolt and ice beam for 4,000 game coins. if you have enough you can pick flamethrower thunderbolt or ice beam. Once you pick one he will ask you what pokemon you want it on. You do not get the TM itself so you have to have the pokemon that you want it on with you. Once he teaches the move he goes inside the game corner and doesnt apear until next Saturday or Wednesday. So your going to have to wait if you want another TM.
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Flamethrower: Growlithe can also learn Flamethrower via the Move Tutor in Goldenrod City (Crystal only)
The game corner on Wednesdays and Saturdays for 4000 coins.
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TM35 (Flamethrower) is located in the Abundant Shrine.
You can find the TM Flamethrower in the Game Corner in Goldenrod city for 10,000 prize coins.