Where did you hear that? There is no such HM as remover in any game.
there is no such thing is a HM called remover
The short answer is no. There is no Dive, HM 08, in Pokemon FireRed.
The HM remover is in Canalave City below the Pokemon center.
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.
icefall cave
pour water on your game
waterfall
At rt 2.
HM 8 doesn't exist in Pokemon Fire Red or Leaf Green.
Celadon City
He is in canalave city in the house right below the Pokemon centre