The number of the TM for Flamethrower is TM29.
You can trade a Pokemon that is holding the TM from diamond to soulsilver or pearl or platinum or you can migrate a Pokemon holding the TM from ruby, sapphire or emerald or firered or leafgreen.
You get the TM Flamethrower at the Abundant Shrine.
at the mauville game corner
Endeavor is not a tm
Hypnosis is not a TM
Flamethrower is TM 35 and you can buy it in the celadon game corner
you can find flamethrower around mt silver not inside it but if u look around u can find the reapers cloth and flamethrower head east from the Pokemon center and u will find flamethrower
You can find Flamethrower as TM. After getting the National Pokedex, you can find it at Abundant Shrine. Come prepared, though, because many Pokemon leading there are unusually strong.
u could get the TM in the Pokemon lottery in emerald version
No, you can not find it in platinum. Moreover, I do not believe that TM EVER existed in any pokemon game though...........