You probably have to migrate from your emerald game if you have one and then go to Pal park. Pal park is below sandgem town and to the right a little ways. but there could be some that dawn's sister or lucas's sister talks about on different days. she lives in sandgem town. hoped that helped!
you don't you get them from emerald or firered/leaf green
Torchic, Mudkip and Treecko
You cannot get all 3 Starter Pokemon in Pokemon Emerald without trading for the other 2.
they are chimchar, piplup and turtwig
There's three starter Pokemon in Emerald, but you can only choose 1. The starter Pokemon are Mudkip Water/ground, Torchic Fire/fighting and Treecko Grass.
turtwig,piplup,and chimchar are diomonds three starting pokemon
Get a Action Replay DS or trading.
You have to trade at the GTS
The only other way is to cheat.
You can't! You'll have to trade with someone, as in Emerald, you can only have one of the three starter pokemon.
There is no other way.
Trade someone with Ruby,Sapphire,and Emerald.