All 150 pokemon are in the game so you dont have to trade for them. BUT IT IS EASYER
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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.
You can get a Cyndaquil without trading only by transfering it from a GBA Pokemon Game onto your Pokemon Diamond Version.
you have to go underground and dig for him
By trading it in from elsewhere, eevee is not available in the main Diamond/Pearl game before the national pokedex. When you have the national dex, however, you just go to see Bebe in Hearthome, in the house right next to the Pokemon center.
In Diamond & Pearl? Impossible without migrating, trading, or Action Replaying.