In Pokémon FireRed, for defeating Brock, his Badge will allow you the use of the Flash HM, Misty's Badge will allow you to use the Cut HM, Lt. Surge's Badge will allow you the use of the Fly HM, Erika's Badge will allow you the use of the Strength HM and Koga's Badge will allow you the use of the Surf HM.
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Keep leveling up your Pokemon and talk to every single person in the game. Certain people give you TMs and HMs, as well as other gifts.
You can't.
In Pokemon series, you generally find HMs soon before or right after you beat gym leaders.
All you have to do is beat gym leaders then the allow you to use HM's out of battle but ether before or after battling the gym leader. Good Luck!
go into your bag. go to the tms/HMS slot. press A. then do use. select the Pokemon you want to use it on. just like TM's, not all Pokemon can learn an hm. hm's can be used over nd over, unlike tms.