In the Digimon video games:
* Digivolving: Omnimon is a powerful Mega-level Digimon that you can evolve your Digimon into through training and specific evolution items in games like *Digimon World*, *Digimon Story*, and *Digimon Cyber Sleuth*.
* Specific events: Some games have events or missions where Omnimon is available as a reward.
In the Digimon anime:
* Through evolution: Omnimon is typically the result of a powerful fusion between two Digimon. In the anime, this is usually WarGreymon and MetalGarurumon.
* Special circumstances: Sometimes, Omnimon can be summoned through special means, such as through the power of a chosen child's courage.
In real life:
* Omnimon is fictional: You can't actually get Omnimon in real life. It's a fictional character from the Digimon franchise.
If you're looking for a way to get Omnimon in a specific game, please let me know which game you're playing, and I can give you more specific advice on how to achieve it.