Yes, there are two. The first is a description of the evolution of Greymon where it is said that the data that formed the evolution rivaled the whole galaxy. Anyway, only a part of the data in question went to the Greymon (At most this could be a feat for the Infermon since he literally destroyed the process of evolution from Greymon to Metal Greymon and Kabuterimon to Altur Kabuterimon).
Besides, that was exactly what happened. When Nanomon broke the Firewall system he allowed the release of Apocalymon that literally formed a Black Hole, this black hole was running on the Datamon computer system that integrated into the Etemon Dark Network system and started sucking everything, according to The Databook the Etemon was sucked into this "other world" and absorbed its energy to return to the Digital World.
The only questioning about this feat would be if it absorbed something give you the power of the source of energy, in some forums this is not accepted, but I do not know if this is not acceptable either.
On the second point, so that it is, the two analyzes can be taken. It has the novel that adimite the size of a solar system, still indeterminate, and in that scene of the anime appears to be the size of a galaxy. I see no problem in relying on the size presented in Novel and consider this as a newer version, moreover as it is consistent with the Large Star feats we have. But we can also choose the Galaxy size to become consistent with the Megas / Ultimates feats we have.
Ok, let's now analyze all the feats of this level we have in the anime and also some of the databooks to see everything we have.
- Apocalymon and Dark Masters, first appearance, and the Four Holy Beasts: Apocalymon almost destroyed the Digital World with his presence, the Four Holy Beasts emerged and defeated the Dark Masters and Apocalymon.
- Bakemon Black Hole: According to the Digimon Reference Book it is said that within Bakemon's clothing lies its true form whose shadow we see is actually a black hole. In the game Digimon Jintrix is said directly that the inner part of bakemon is a black hole and finally in one of the card of the Battle Terminal can be seen inside the body of the Bakemon and is perceivable something that resembles a black hole.
- Dark Masters, returning after their defeat: After a long time after being defeated by the Four Holy Beasts the Dark Masters come back to life and again confront the Four Holy Beasts. This time the Dark Masters beat the Four Holy Beasts and then they are sealed.
- Apocalymon: After being released from Wall of Fire Apocalymon resurfaces and creates a black hole in milliseconds. This black hole was sent to the Nanomon system and modified the Dark Network that sucked Etemon, Datamon and other Digimon.
- Chaos Etemon: The energy contained in Chaos Dark Spirits was enough to create black holes.
- Gerbemon: Gerbemon's garbage can contains a powerful Black Hole
- Vademon and Altur Kabuterimon: Vademon created a dimension containing a solar system surrounded by stars / a galaxy. Altur Kabuterimon was able to destroy Vademon and thus destroyed that dimension / destroy Vademon that held the dimension (This was ambiguous, but the end result is the same).
- The Dark Masters remodeled the Digital World using their powers and created the Spiral Mountain.
- Metal Etemon: After the power of the black hole collapsed into Chaos Etemon he was sucked into another dimension where he stayed inside the Black Hole for a long time being destroyed and regenerating in an infinite cycle. After a long time Chaos Etemon regains control and fully absorbs the power contained in that world thus turning Metal Etemon.
- Apocalymon: Apocalymon returns and again threatens to destroy everything that exists to create a new world. Its main body is destroyed by the chosen children and then using the power left in the Darkness Zone was created a Big Bang that would destroy the whole world. The power of the 8 Digiveices nullified the explosion and used their power to rebuild the Digital World.
- Wendimon: Wendimon creates a pocket dimension containing a Sun.
- BelialVandemon: Using his power of darkness he would merge the Digital World and the Real World to become the ruler of both. It took the power of Chosen Children from all over the world to contain their evil power.
Finally we have the feats of Dark Super Starmon that are located in Tier 4 (I still have to make a profile for him e.e). Also, I know that the feats of Bakemon and Gerbemon, and those who destroyed them, are not qualified, but by all means I think it is good to mention them.
