Why didn't Flamethrower thaw Arcanine?

Question

I was playing Pokemon White 2 in the Champions Tournament against Cynthia, then her Glaceon used Ice Beam and my Arcanine was frozen solid, then I used Flamethrower but Arcanine didn't thaw out.

Answer 1

Other than the moves Flame Wheel, Sacred Fire, Flare Blitz, Fusion Flare, Scald, and Steam Eruption, a damage dealing Fire type move only thaws a frozen Pokemon if it used against the Pokemon, not by it.
For example, if a frozen Pokemon is hit by Flamethrower by an opponent or teammate, it will be thawed, but it cannot thaw itself with Flamethrower.

Source