He only learns it via breeding but only in Pokémon HeartGold and Pokémon SoulSilver.
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Unfortunately, Arcanine does not learn Flamethrower. Your must level your Growlithe up to lv 50 to learn Flamethrower and then evolve it to Arcanine in order for Arcanine to have the move.
Arcanine doesn't learn Outrage, Growlithe does (only on Black 2) at level 43
yes
Sadly, Arcanine does not learn Crunch in Red/Blue/Yellow OR LeafGreen/FireRed. Sorry :[ Good Luck!
Only its former evolution, Growlthe, can learn it before it. When you evolve Arcanine, it cant learn ANY of growlthes moves, but can learn extreme speed at level 33. Or you could just teach Arcanine flamethrower by using the TM flamethrower, otherwise, you will have to level up a growlithe until it learns flamethrower then evolve it into an arcanine.