get it from this fisherman i think
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
use flash
In Pokémon Dark Rising 2, you need to obtain the Cascade Badge to use the move Flash outside of battle. The Cascade Badge is awarded after defeating the Gym Leader at the Cerulean Gym. Once you have this badge, you can use Flash in dark areas to illuminate your surroundings.
you need the Mauville city gym badge. (the electricity gym) if im not mistaken
Use mr briney's ship to reach dewford town.
U will need flash for this. once you have flash you stand in the middle of his cave and use flash then go in and catch the FUTHAMUKA
Walk to the middle of the cave and use flash.
in emerald hm05 is flash, you find it in granite cave but you have to have the knuckle badge to use it outside of battle
First you need the first badge then you need the HM Flash which is given by the oak aide on route 2 lastly go inside rock tunnel and choose the Pokemon that has flash then choose flash the cave will be lighted up more!
Lavaridge town is where you get the fourth badge in ruby.Hint:the gym leader uses fire types so use a water type.
In Pokémon FireRed, for defeating Brock, his Badge will allow you the use of the Flash HM, Misty's Badge will allow you to use the Cut HM, Lt. Surge's Badge will allow you the use of the Fly HM, Erika's Badge will allow you the use of the Strength HM and Koga's Badge will allow you the use of the Surf HM.
You need at least the first badge to use flash.