How do you get hm flash in Pokemon darkflame?

There is no Pokemon game called "Pokemon Darkflame." If you are referring to a specific Pokemon game, please specify the game's name so I can help you find the location of HM Flash.

For example, you could say "How do I get HM Flash in Pokemon FireRed?"

Once you let me know the game you're playing, I can guide you on how to obtain HM Flash.