You can only get one. If you use the action replay, though, then you can either use the wild modifier code or catch trainer Pokemon code to get all three of them.
It is not possible to get all three starters in Pokemon LeafGreen without trading. This was an intended mechanic to encourage interaction between players.
You don't not unless you trade or cheat
There's only one way to get all 3 starters in Pokemon HeartGold/SoulSilver, but you will need to have 2 DS's and 2 games. You start with a Pokemon and trade it on your other game on your other DS. You start a new game and then do the same with your other 2 and then trade them back. You then have all 3 starters.
By trading the other starters with other players of Diamond or Pearl.
with an AR
You can only get one. If you use the action replay, though, then you can either use the wild modifier code or catch trainer Pokemon code to get all three of them.
To obtain all three starters you need to trade with someone.
You can get three starters from different areas by completing the game (one at the beginning from johto, and after defeating red one from kanto and one from hoenn) but unless you trade or cheat there is no way to get all three starters from any one area.
The Availible Starters Are -Chikorita Grass Type Pokemon -Cyndaquill Fire Type Pokemon -Totodile Water Type Pokemon They Are All Availible In Pokemon HeartGold And, Pokemon SoulSilver
After you defeat red, Prof. Oak gives you ONE of the starters, but you cant catch the starters nor get all of them at once
all the previous starters, you get to pick one from each new edition... or at least that's what I've heard. sorry if I'm wrong X(
in my heart
It is not possible to get all three starters in Pokemon LeafGreen without trading. This was an intended mechanic to encourage interaction between players.
Starters are intended to be rare, one-of-a-kind Pokemon. That's not to say there hasn't been a main series Pokemon game that has allowed you to get all of the starters, though - in Pokemon Yellow, you could get all three starters available at the time.
All those pokemon would need to be migrated to Heartgold/Soulsilver.
It is impossible unless you hack