Assuming you mean the hm fly on Pokemon crystal, you get it from the lady out side of Cindawood gym.
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Outside Cianwood City Gym.
In Pokemon Crystal, the HM Fly can only be obtained after defeating the gym leader in Cianwood City. After winning the badge, speak to the woman standing out side of the gym. She will give the player Fly.
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.
You capture a Pokemon that has wings and find HM fly teach it to the Pokemonthat you caught and then go on to the menu and click Pokemon and thenclick the Pokemon you caught and then it says fly and just click fly.
at the city of the Pokemon league