HM05 was entrusted to one of professor oak's many aides he is on Route 2 inside a building you can only reach by Cutting down the trees on this route alternatively if you reach Vermilion City and pass through Diglett's Cave you can go south and use Cut to enter the building. Inside you must show the aide you have registered 10 different kinds of pokemon in your pokedex if you do he will reward you with HM05.
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There Are Only 7 HM's In Pokemon Firered. Hm01- Cut Hm02- Fly Hm03- Surf Hm04- Strength Hm05- Flash Hm06- Rock Smash Hm07- Waterfall
hm05 is flash
go 2 route 18 and surf. you'll find a ledge. hm05 (waterfall) will be on the ledge.
In Pokemon firered you can't, but in Pokemon leafgreen you can get it then trade it to Pokemon firered.
To get Pokemon firered on PC download a vba and Pokemon firered ROM