Some more help with Pokemon Fire Red Version please?

Question

Hi, I just beat Lt. Surge and I am wondering a couple things-

How do I GET Fly? (I can already use it but I don't have it)

How do I get Flash and which Gym Leader lets me use it?

Thanks for helping!

Answer 1

You get fly to the left of Celadon City later in the game.

You get flash from Prof. Oaks Aide after catching 10 pokemon, he is on the other end of Diglett Cave. Beating Brock,(gym leader 1) lets you use flash.