You can find TM70 Flash in Oreburgh Gate, the cave west of Oreburgh City. Once you're inside, go left, then go up, then right. Go downstairs. You will need to use Rock Smash in here to find it. You can also buy it on the 3rd floor of Veilstone Department Store for 1000 Poke.
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the hiker is in mt.cornet
In Pokemon Platinum, Flash is a TM.
HM Flash is now TM 70, and you can get it either at the Sprout Tower, or bought at the Goldenrod Department Store.This is not optional for the first way. Go through sprout tower and when your at the top beat the elder, then he will give you TM flash. (YES IT IS A TM!)
Hypnosis is not a TM.
Ok in the veilstone department store on floor B3 the top person sells it (it is TM 70)