go throug the diglet cave and keep going south eventualy you find a a thing like when you go in veridian forest go in there and you will see two people talk to them an one will give you HM 05 FLASH
you will need to have all data for at least 10 pokemons
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You cannot get it in Pokemon FireRed. It doesn't matter because it is not necessary in Pokemon FireRed.
HM 8 doesn't exist in Pokemon Fire Red or Leaf Green.
HM 05 is flash
Use the HM move Strength.
In Icefall Cave, in Four Island