Go to the top of Sprout Tower in Violet City and battle the guy who your enemy guy just battled. When you beat him he will give you HM Flash.
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Pokemon Crystal only contained seven HMs. The 8th HM Rock smash isn't available until later generation games. The HM one can get in Pokemon Crystal are cut, fly, whirlpool, waterfall, strength, flash, and surf.
sprout tower in violet city. you have to win against all the monks. geeeze
HM 05 is flash
In Pokemon Platinum, Flash is a TM.
i dont think nobody knows its in the bell sprout tower after you defeat the main guy