No that would be nice though to get more light defeat pokemon.
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When a Pokemon has the move Flash, you go into Party, then select the Pokemon with Flash using the 'A' button and there should be an option that says "Flash". It is only usable in dark locations or within battle.
You can only use it in Rock Tunnel, where it's really dark and you can't see a thing :p
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.... :)
how do you use flash? just go to pokemon and go to the pokemon that knows flash. press A and it will say in blue text "Flash" select that and it will use Flash. it's very useful in dark caves.
You need at least the first badge to use flash.