57
Tortera learns leaf storm at level 57. I would recommend not evolving it because grotle learns i at level 52. And turtwig learns it at level 45 so you should wait to evolve it.
It should learn it at level 52, if you evolve it, Torterra laerns it at level 57.
It will only learn leaf storm if you migrate it to diamond, pearl or platinum.
level 100
Torterra can learn Leaf Storm at level 57.
level 96
he learns leaf storm at leval 67.
Torerra learns leaf storm at level 100
It never will.
A Torterra evolves at level 32 and learns Leaf Storm upon evolving
Unless you have the TM (technical machine) Leaf Storm, Victreebel cannot learn Leaf Storm at or above level 48.
Victreebel learns leaf storm at level 47. Some other moves that Victreebel is able to learn include vine whip, and energy ball.