you can't catch a wild turtwig. I know it sucks. You must breed one or trade with another turtwig owner.
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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 is a starter Pokémon, it can't be found in the wild. If you choose another starter, then the only way to obtain it is to ask a friend who started with Turtwig to breed it and trade the egg with you.
Turtwig is a Hoenn region starter Pokemon. Thus, it cannot be found in the wild for capture in HeartGold. However, after defeating Red at Mt. Silver, you have a chance to get a Turtwig. Go to Silph Co., talk to Steven (the Hoenn champion), and choose the green stone to get a Turtwig.
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.
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.