It Is called surf and you need to go to fuchsia city and go in the safari zone. It will be in the secret house. Hope this helps :)
The short answer is no. There is no Dive, HM 08, in Pokemon FireRed.
Their are 7 HM's available in Firered.
You cannot get it in Pokemon FireRed. It doesn't matter because it is not necessary in Pokemon FireRed.
Where did you hear that? There is no such HM as remover in any game.
icefall cave
At rt 2.
waterfall
pour water on your game
HM 8 doesn't exist in Pokemon Fire Red or Leaf Green.
Celadon City
Either by using the HM Strength or by using the HM Rock Smash
You need to learn the HM strength.