How do you tortomon on digimon dawn?

There is no "Tortomon" in the Digimon Dawn game. It's likely you're thinking of a different Digimon or game.

Perhaps you're thinking of:

* Tortomon (Digimon World 3): This is a turtle-like Digimon that evolves from DemiMeramon in Digimon World 3.

* Tortomon (Digimon World Next Order): This is a different Tortomon than the one in Digimon World 3, and it evolves from DemiMeramon.

If you could provide more details about the Digimon game you're playing, I might be able to help you further.