I don't know oh yeah i do after you beat the league
Flash is TM 70 and can be found in Castelia's Mode Street.
its in the goldenrod department store in the tm corner on the 5th floor
u can't get it it is not a tm
In Pokemon Platinum, Flash is a TM.
in a cave...
TM91 can be found in twist mountain
On Pokemon Heart gold Version flash is a TM, TM 70 to be exact and is sold in goldenrod city department store or you can do this.... Or you can obtain it for free at Violet City's Sprout Tower. Or this Or that wth? And what is .... anyway?
Tm 70:)
Teach one of your pokemon 'flash' using a TM/HM
you get it at the battle subway prize stand
You use the Rock Smash TM
A man gives you the TM in an alley in Castelia City.