You can't find Turtwig on FireRed because he is in a different generation of the game. He is only found in Diamond and Pearl.
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you can if you trade
starter Pokemon
Turtwig is a starter Pokemon in Pear, Diamond and Platinum or you can obtain through trade
Choose it as a starter.
You can not get a Turtwig egg in Pokemon Platinum. But if you breed a Turtwig with a Ditto, then it is possible.