You must trade with another firered or leafgreen.
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you can not get all 3 starters unless you trade yea u can u just need lots of masterballs or a code to let u take other Pokemon
Well, there are actually 4 fire starters and they are Charmander from Kanto, Cyndaquil from Johto, Torchic from Hoenn and Chimchar from Sinnoh
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
By trading the other starters with other players of Diamond or Pearl.