Here are a few ways to get a Treeko in your Emerald game if you chose Torchic:
* Trading: The most common way is to trade with someone who has a Treeko. This can be done online or in person.
* Cheats: If you use cheat codes or save editors, you can add a Treeko to your game. However, this is not considered a legitimate way to play.
* Events: Occasionally, Nintendo has events where you can get special Pokemon, including starter Pokemon. You may be able to get a Treeko through an event.
So, unless you trade or use cheats, you won't be able to see Treeko in your Emerald game if you picked Torchic.