You need to know the HM cut to be able to get the HM flash. Once you have the HM cut, go into the diglett's cave near Vermilion city. Go all the way through until you reach the climbing up ladder. Cut down the tree in front of the small house. Go inside the building after you cut the tree, and one of professor Oaks aides will be waiting there to give you the HM flash. (Note that you must have 10 Pokemon at least to receive the HM)
Go to the rock tunnel in the east.
all the way back in butts cave
You get it from oaks aide on route 2
I believe it is southwest of Lavender town
Yes you can. All HM items can be utilized numerous times.
You get Hm flash from the hiker in granite cave in dewford.BEWARE!You can only use flash if you get the knuckle badge from Brawly
On route 2 an oak aide is in a big building but normally you can't get there unless you use Cut. Using Cut you can get rid of trees and reach a secret path leading to the big building where the oak aide is and when you talk to him say yes to his question to get hm flash.
Flash. You get it from the aid right about pallet town. before you go to rock tunnel. (YOU NEED 10 Species of Pokemon to get it)
HM05 (Flash) can be obtained from Professor Oak's Aide after going through Diglett's Tunnel in Vermilion and going down to the bush that needs to be Cut (To get Cut, go onto SS Anne in Vermillion and talk to the captain after defeating your rival). After cutting the bush, go in the building and talk to the Aide. In order to get Flash you'll have to have caught at least 10 kinds of Pokemon.
go through the Diglett's cave then back to Route two. theres a building there and talk to Prof. Oak's Aide
teach a Pokemon the hm move flash
y beat brock at pewter Jim