Is flamethrower viable for machoke/machamp?

[croissant]

@TheDancingRoserade No, because even if we put aside this Pokémon's horrible special attack, the main targets of fire moves are Steel, Ice (which are covered by the fighting STAB) and Grass (which you can run Ice Punch for since it also helps against fat grounds such as Hippowdon or Landorus-T), and thus Flamethrower is pretty much useless in every scenario.