* Leveling up: Garchomp does not learn Fire Fang by leveling up.
* TMs/HMs: Fire Fang is not available on any TMs or HMs in Omega Ruby.
* Breeding: Garchomp cannot learn Fire Fang through breeding, as it is not in its egg move pool.
However, you can obtain a Garchomp with Fire Fang through the following methods:
* Trading: You can trade with another player who has a Garchomp that knows Fire Fang.
* Poké Transporter: You can transfer a Garchomp with Fire Fang from a previous generation game, such as Diamond, Pearl, or Platinum, using the Poké Transporter.
Important Note: The Poké Transporter is not available in the main game. You need to use the Pokémon Bank, which is a paid service, to transfer Pokémon from older generations.