Only way to get it is by choosing it as a starter Pokemon.
Torchic evolves into Combusken at Level 16.In Emerald it is at Level 17.
The only way to get a Torchic in Emerald is if you chose it as your starter at the beginning of the game.
Treecko, Torchic, and Mudkip.
You get it in the start
It's not possible to simply find a Torchic egg on Pokémon Emerald. Instead ,you would have to breed a female Torchic, Combusken or Blaziken.
Nowhere, as you can't catch a Torchic in the wild. If you want a Torchic, you'll have to trade it from another Ruby/Sapphire/Emerald game.
torchic easy
The starter Pokemon are Treecko,Torchic and Mudkip.
torchic
treeko,torchic,mudkip
torchic mudkip treeko
The only two ways to get a torchic in emerald is to choose it as your starter, ortrade with another emerald, ruby, sapphire user that has it.