Flash is in the Granite cave. Talk to the hiker guy as soon as you walk in the door. He should give it to you.
talk to customer service
Talk to them on twitter. That could help.
When you first enter granite cave you should see a hiker if you talk to him he gives you HM05 which contains Flash.
You find the HM for Flash in Granite Cave in Dewford, talk to that person by the entrance and he gives you it.
You get Hm5 Flash in the passageway between Videran Forest and Perter Town. You talk to the professor guy in the passageway and you must have ten Pokemon in your pokedex and you will get FLash.
the HM flash is in the cave on Dewford town and Steve, the first man in there has it. All you have to do is talk to him but you do NOT have to battle him. Almost the only time you have to use flash is when you reach Ever Grande City. Shortened answer Talk to the fat guy in the entrance to the cave in Dewford.... :)
Go to Dewford city. In the cave, there should be a hiker right next to the entrance. Talk to him and he will give you Flash.
you talk to some guy in sprout tower
steven and if you talk to the men he will give flash
Upon entering the Dewford cave, there should be a hiker guy right by the entrance. Talk to him and he should share Flash with you.
go to dewford city and go into the cave near there there is a hiker inside talk to him after beating brawly the gym leader to get flash.