>>54070769We don’t have one as most Pokémon fusions are a combination of a suppressed Legendary Pokémon and a version exclusive subordinate to it.
Omegamon would have been like if Solgaleo or Lunala fused, or if Reshiram or Zekrom fused. What we have for Pokémon would be if Imperialdramon FM fused with WarGreymon and has a WG form that resembled Omegamon, and another form with MetalGarurumon.