Turtwig is a starter Pokémon in Pokémon Diamond Pearl and Platinum. It is not possible to catch one. The only way to get it is to start the game with one.
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It is not possible to catch a wild Turtwig on Pokemon Diamond. It is generally impossible to find and catch Starter Pokemon in the wild. This was a mechanic designed to encourage player interaction for trading.
Turtwig does not appear in Pokemon Sapphire, or in Hoenn for that matter. Instead, you can find Turtwig in Generation IV (Diamond, Pearl, or Platinum).
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.
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.
The starter pokemon for Diamond and Pearl are Turtwig, Piplup, and Chimchar.