To use the HM Fly, you have to have the Thunder Badge, won from Lt. Surge in Vermilion City.
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The Thunder Badge
To use fly , its at the left of where you go into Pokemon,then click the Pokemon that kknows it,and its in blue letters
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.
First you need the 3rd badge, Second you must teach the move to a Pokemon that can learn it (almost all flying types can learn it). Third press Start and press A on Pokemon choose the Pokemon that knows Fly and press A on it notice Fly will be highlighted in blue press A on it know the kanto map will open up move your cursor to any town or city then press A on it to Fly there. Fly only works when your outside (occassionally in some forests you can Fly). You can also use Fly to go between the islands in the game.
after u defeat Pokemon lege u get ticket then fly to olivine then take the boat 2 kanto