Godzilla (Shin Godzilla continuity - 2nd Form):
Height: 125 ft (38 m)
Mass: 17,000 metric tons
Powers/Attacks:
-Amphibious Respiration
-Environmental Adaptation
-Powerful Jaws
-Powerful Tail
-Radioactive Bodily Fluids
-Razor-sharp Teeth
-Reactive Adaptation
-Regeneration
-Speed Swimming
-Superheated Blood Emission
Weaknesses:
-Cellular Inhibitors
-Overheating
Feats:
-Can push forward enormous boats and destroy small manmade structures such as bridges.
-Can demolish houses and buildings by ramming into them.
-Can climb onto/hug small buildings, smashing them apart in the process.
-Travels 13 km/h.
Who would be the most powerful, the largest and the most intimidating monstrosity that Kamata-kun could slay with his own power? Assuming the battle takes place in generic city filled with rather small buildings, with no humans butting in.