No, you can only get all starters without trading in Pokemon yellow, but Leaf Green is a newer version of Pokemon green, so it's impossible.
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It is not possible to get all three starters in Pokemon LeafGreen without trading. This was an intended mechanic to encourage interaction between players.
That's impossible.
By trading the other starters with other players of Diamond or Pearl.
No matter what game of Pokemon you play to get all the starters you have to trade with the other versions.
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