Go to the SS Anne in Vermilion City and find your way to the Captain's Quarters. The Captain will give it to you if you give him a backrub, but make sure your Pokemon are healed before you enter because your rival will want to battle u.
S.S. Anne captain will give it to you for making him feel better.
Use Cut on the door.
you get it in the captains quarters.
use cut. ;)
In LeafGreen/FireRed, you get cut on the S.S Ann from the captain after beating your rival.
use hm Cut.
The HM move cut
Cut,Strength,Rocksmash.
The HM's that are in leafgreen are: Cut, Fly, Surf, Strength, Flash, Rock Smash, Waterfall.
First you have to teach a Pokemon cut and walk into the grass and then use cut to cut the grass OK!
Look it up on Serebii.net it has every thing you can think of about Pokemon in all of the games
hm01 cut
Right of Cerulean city is a tree to cut. Cut it and follow that Path