Well, you have two options:
1. Cheat and use a GameShark.
2. Get a starter. Trade it to a friend, and then start over. Then get another starter at the beginning of the next game. Trade it also to your friend. Then, start the game over a third time, and Get the final starter. Have your friend trade all those starters back to you, and then you have them all!
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you must trade over them the 3 starter pokemon in pokemon red and blue are bulbasaur squ
You cannot get all 3 Starter Pokemon in Pokemon Emerald without trading for the other 2.
You can get another starter if you get all the sinnoh pokemon. Proffeser rowan will ofer a johto starter.
You can't catch a starter Pokemon. But to get all of the starters you can trade the Pokemon to another game and restart the game you were playing and get a different starter.
type this code 010075DA and now u can get all three starter Pokemon