1. Flash is a TM 2. You can find TM Flash in Castelia city 3rd gap from the right go near the dumpster and a guy with sunglasses will appear he will give it to you.
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It's not an HM in Black and White.
it should tell you when your teaching a Pokemon a TM/hm!
yes
You cannot get the TM/HM Whirlpool in Pokemon Black or White.
Teach one of your pokemon 'flash' using a TM/HM