You can't! You'll have to trade with someone, as in Emerald, you can only have one of the three starter pokemon.
In Emerald you can't get Totodile, Chickorita and Cyndaquil, you can only get them in Gold and Silver. In Emerald you get Torchick, Mudkip and Treecko.
If you pick Treeko, she picks Torchick. If you pick Torchick, she picks Mudkip. If you pick Mudkip, she picks Treeko.
Mudkip is a starter Pokemon on Pokemon Emerald, Sapphire and Ruby. This means that it is the first Pokemon you get. You get starter Pokemon near the beginning of the game from Professor Birch. Other starter Pokemon are Torchick and Treecko.
If you pick Treeko, she picks Torchick. If you pick Torchick, she picks Mudkip. If you pick Mudkip, she picks Treeko.
Mudkip is AWSOME as well as Torchick. I have a Grovile. It is good. My friend says that Torchick is powerful.
mudkip,treeko and torchick.
You have to trade it with someone who has a Blaziken.
mudkip
Mudkip, Torchick, and Treeko
you must trade mudkip from another Pokemon emerald, Sapphire, or ruby
if you have saphire, ruby, or emerald start over on that game then pick mudkip and migrate him
treeko , mudkip , torchick and that's correct