1. If Godzilla hits Toothless once, it's dead
2. Godzilla is enormous
3. Godzilla is a much better swimmer
4. Godzilla bested King Ghidorah in a brawl
5. Godzilla has survived nukes, being thrown into skyscrapers, and extremely high falls
6. Godzilla can roar up to 174 decibels, which can disorientate Toothless
7. Toothless can't really hurt Godzilla in a critical way
8. Toothless will need to recharge his plasma blasts
9. Godzilla can fire atomic breath
10. Godzilla has more experience than Toothless, being older than the Triassic period, which was over 200 million years ago
11. Godzilla is also really intelligent