Well you have to trade from Pokemon Diamond or Pearl, but otherwise you cannot.
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You can not get a Turtwig egg in Pokemon Platinum. But if you breed a Turtwig with a Ditto, then it is possible.
at the begining of the game the profeser will give you three Pokemon and you have to pick one and those three Pokemon are turtwig chimchar and piplup and if you want turtwig pick turtwig.
you cant you can get one by link cable(trade)from Pokemon d/p/pt(dimaomnd,pearl or platinum)you can trade from Pokemon diamond,pearl or platinum. soulsilver and heartgold are compatible with those games
u might not like this answer, but sorry, you can't get turtwig in Pokemon emerald. turtwig was created in the newer games, like Pokemon diamond and pearl. but if u do get Pokemon diamond or pearl, u can choose turtwig, chimchar or piplup as your starter Pokemon. but in flora sky [same as emerald] there are turtwig, chimchar and piplup as your starter.
starter Pokemon