In the Generation V games (Black, White, et cetera) Flash is not an HM.
To find it (as TM70) go to Castelia City. down one of the streets (the narrow one with dumpsters) you will find a man behind a dumpster. talk to him to receive TM70 Flash.
Chat with our AI personalities
There is no "HM" mean look.
He is in canalave city in the house right below the Pokemon centre
Just learn it the HM Cut
flash isn't a HM it is a TM
The house above the pokeshope in canalav city