It depends on what type of crystal. You may be accused of smuggling.
(Crystal would probably prefer her own seat)
shine a torch light in your ear and the fly will come out
Tweezers.
You can use fly anytime you are outside.
You Use fly and just fly there
Assuming you mean the hm fly on Pokemon crystal, you get it from the lady out side of Cindawood gym.
Go fly
liquid crystal isn't actually a real Pokemon game
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.
liquid crystal isn't actually a real Pokemon game
You get it from a girl in Cianwood after you beat chuck.
* firefly * fly
Chuck's Wife (in front of the gym) Will give you Fly after you beat Chuck