By using a ghost or a dark type move (super effective). Fighting against Drifblim: don't and i repeat, DON'T, use a physical attack on Drifblim. You will suffer from Drifblim's Ability.
The ability is called Aftermath or Unburden. It is when the attacking Pokemon uses a physical move and takes a recoiled dmg
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You have to do the Beauty contest to get down the elevator.
beat 5th gym leader then talk to his wife
Try his perents house
After you beat the 5th gym leader, some random lady outside of it gives it to you.
You get Fly after you beat the 5th Gym Leader (Chuck). Chuck's wife will be outside the Gym, and if you talk to her, you will get Fly.