After you beat Chuck, leader of the Cianwood City gym, talk to his wife who is walking in front of the gym. She'll give it to you.
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Assuming you mean the hm fly on Pokemon crystal, you get it from the lady out side of Cindawood gym.
Outside Cianwood City Gym.
in the lidivity city fools
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.