Nowhere.
dig
You get it when you battle your dad which is the fifth gym
In Victory Road.
Mt.moon
This TM doesn't exist in leafgreen.
TM 42 Facade can be found in the Marine Tube (Undella to Humilau)
There is no Tm trick in leaf green
Nowhere.
dig
You get it when you battle your dad which is the fifth gym
you cant go underwater in leafgreen!!
In Victory Road.
Mt.moon
please take chack for tm in pokemon leaf green
all the answers about Pokemon are on serebii.net
That TM is hidden in the power plant.