there is no other way unless you either trade or go to the global trading center in jubilife
Get a cheat device. In other words, you can't do it legally
U cannot get more than one starter without trading kyogre239
You cannot get all 3 Starter Pokemon in Pokemon Emerald without trading for the other 2.
You cant without action replay
You can't unless you picked it as starter pokemon.
You don't. Its not possible
That's impossible.
its simply not possible
It is impossible to get all three starter Pokemon in one game without trading, unless you are willing to use an Action Replay.
There is no other way.
Not without trading from another game.
Try the GTS trick.