How do you get magnamon in Digimon World Dusk?

You can't get Magnamon in Digimon World Dusk. Magnamon is a Digimon that only appears in Digimon World Dawn.

To get Magnamon in Digimon World Dawn:

1. Obtain a MetalGreymon: Evolve a Greymon to a MetalGreymon by training it to its maximum level and evolving it with the "Evolve" option in the Digivolution menu.

2. Evolve MetalGreymon to Magnamon: You need to defeat the Digimon Champion, "GigaDevimon," in the "Digimon Coliseum" to unlock the ability to evolve MetalGreymon to Magnamon. After defeating GigaDevimon, go to the "Evolve" option in the Digivolution menu and choose "Magnamon".

Note: Magnamon is not obtainable in Digimon World Dusk.