The Digital Hazard symbol isn't what you're describing. In Digimon it can mean one of two things; a dangerous emergency, or the mark itself. In the main null canon and Tamers, the Hazard is a warning symbol like the radioactive symbol on biohazardous waste. It's nothing more than a symbol, with the danger coming from the Digimon ITSELF, not the symbol.
Chaos Dukemon does have the hazard symbol, in the same spot as Dukemon. In fact the profiles state ChaosDukemon and Megidramon are the same being perceived in different forms - essentially they're a being so terrifying different people perceive them in different forms. What ChaosDukemon lacks is the symbol of the Digi-Entelechia/Catalyst, which is the symbol on Culumon/Calumon's forehead, and which all of the three main Digimon from Tamers' final forms have somewhere on their bodies.
Lucemon has the Hazard symbol. MirageGaogamon does too.
The other way Digital Hazard is used is in the backstory and supplementary materials for Xevolution and the Pendulum X toys. It's the extinction level event that causes Yggdrasil to delete the old Digital World and start over with a new one, using Project Ark to save a few of the select Digimon he chose to save. However, a select few Digimon developed the X-Antibody, which made them stronger and changed their bodies, allowing them to survive the Hazard and move to the new digital world.
The fact that the term was used twice, along with Megidramon's anime portrayal, is what led to the Hazard's mythic status that absolutely everyone who had the symbol was a potentially would ending bad ass, but MirageGaogamon having it shows that the mark itself is only a warning of terrifying potential.