How do you get ommimon in Digimon World dusk?

You can't get Ommimon in Digimon World Dusk. Ommimon is a Digimon that exists in other Digimon games and media, but it's not available in Digimon World Dusk.

However, you can get some powerful Digimon in Digimon World Dusk, such as:

* Imperialdramon Paladin Mode: This is a powerful Dragon-type Digimon that can be obtained by evolving WarGreymon with the "Digi-Egg of Miracles" (obtainable in the post-game).

* MagnaGarurumon: This is a powerful Wolf-type Digimon that can be obtained by evolving WereGarurumon with the "Digi-Egg of Miracles."

* UlforceVeedramon: This is a powerful Dragon-type Digimon that can be obtained by evolving Veedramon with the "Digi-Egg of Miracles."

While these Digimon may not be as powerful as Ommimon, they are still extremely strong and will help you to conquer the game.