TM27 Return can be found on Route 12 by talking to the little girl on the second floor of the first building to the south of Lavender Town.
Nowhere.
dig
In Victory Road.
Mt.moon
all the answers about Pokemon are on serebii.net
This TM doesn't exist in leafgreen.
There is no Tm trick in leaf green
Nowhere.
dig
you cant go underwater in leafgreen!!
In Victory Road.
Mt.moon
please take chack for tm in pokemon leaf green
TM 27 is Return.
all the answers about Pokemon are on serebii.net
Actually it's not a TM. You have to get a move tutor in FireRed or LeafGreen to teach it to a Pokemon.
Flamethrower is TM 35 and you can buy it in the celadon game corner