you dont you have to get them through a trade or you could just get the same one from breeding at the daycare
That's impossible.
two words: YOU HACK
you cant
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.
It is impossible without trading from Diamond, Pearl, or Platinum, or without the use of a glitch or cheating device.
By trading the other starters with other players of Diamond or Pearl.
You have to complete your pokedex the oak gives you a call
its impossible to get sinnoh starters without trading them from other gen IV games. use the palpark in fuschia city to trade them from pearl/diamond/platinum.
There are a lot of them, like the starters from the other generations.
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 cant get mudkip without trading on platinum
There is no way to get Bulbasaur in Platinum without trading or Pal Parking.