I want Hulkzilla just to see how batshit insane a composite Goji is
Hulk would probably win cause of the immortal hulk stuff.
But from the Singular Point anime, Godzilla is an eldritch being called a Singular Point, which is a literal "bad future".
the Godzilla we see in the series is actually just a shadow of the true Godzilla which exists in the 4th dimension and in another world. There is actually two known godzilla's in Singular Point, Godzilla Ultima which appears in the end of the series, and a smaller Godzilla that the Japanese found during WW2 and put its skeleton in a secret base. There's also evidence to suggest that in SP Godzilla was the beast of revelation and previously appeared in feudal Japan.
So even if you kill the physical body Godzilla will not die.
Once evolving into Ultima, Godzilla in its 100+ meter size is capable of bending space-time near itself and releasing large amounts of Red Dust. (To note, Ultima when it first appeared was only 45 meters it grew too over 100 meters at the end of the series)
Godzilla once reaching the "anointed time" is capable of destroying the universe. Its unknown in the series how but its possibly has to do with evolving far enough to cause a false vacuum decay.
Godzilla was stopped due to Jet Jaguar PP, who used the Archetype's time-bending properties to put itself into a time loop to fight Godzilla until it can find the code for the Orthogonal Diagonalizer.
Archetype is a special material that exists in a higher dimension, just like Singular Point's the Archetype shown in the series is only a shadow of its true self. Singular Points like Godzilla are capable of producing Archetype and incorporate it into their biology, possibly even creating there 3d bodies from it.
The Orthogonal Diagonalizer is a programmable atom, which can change the phase of the Archetype. Thus also being able to nullify it, however, this requires a special code, if wrong it could cause catastrophic effects like turning water into salt. After Jet Jaguar PP calculated the right code it was able to use the OD to destroy Godzilla's body and nullify all the red dust around the world.
However it seems that it didn't effect the true godzilla.
That's a broken down version of Godzilla from SP, I actually made a respect thread for it but had to delete cause the videos took to much space on gdrive.
This is only for the anime btw, there's a guidebook and novel that apparently gets into multiversal stuff.
@Mr.OMG has the scans.