There Are Only 7 HM's In Pokemon FireRed.
Hm01- Cut
Hm02- Fly
Hm03- Surf
Hm04- Strength
Hm05- Flash
Hm06- Rock Smash
Hm07- Waterfall
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HM 8 doesn't exist in Pokemon Fire Red or Leaf Green.
You cannot get it in Pokemon FireRed. It doesn't matter because it is not necessary in Pokemon FireRed.
HM08 doesn't exist in firered.
Use the HM move Strength.
In Icefall Cave, in Four Island