How Is Godzilla Going To Beat Ghidorah?

I do not think that the final battle will be 1v1. In the trailer, we can see Mothra and Rodan flying next to eachother. 

I think that Godzilla will kill Ghidorah, but not without receiving a lot of help from Mothra and Rodan. I personally think that he'll rip each of Ghidorah's heads off but I do think that it's a possibility that Ghidorah doesn't die and returns in GvKong

Honestly, I think getting a power-up from Mothra and/or Rodan might be the way to go.

During the end of the trailer, Godzilla's dorsal plates are constantly glowing, which could signify that he's currently powered up. I think that the key to defeating Ghidorah will be him gaining further energy to overwhelm his rival.

The Hood: That's an interesting possibility. Kong and Godzilla teaming up to fight Ghidorah. 

TheGMan123: It seems more likely that something like that would happen. Godzilla (As far as I know) stands at only 108 meters. Ghidorah, however, is 50 meters taller, standing at 158 meters. Godzilla is more or less at the height disadvantage against Ghidorah, not to mention that Ghidorah has 3 separate heads with different personalities, as well as his iconic Gravity Beams and creating a huge electrical storm whenever he flies. We don't exactly know how Ghidorah will actually behave like in the movie, and the only thing that we see is him wanting to destroy as much as he possibly can; I'm saying that we only see his aggressive personalities in the clips from the second trailer. SPOILER ALERT: A person who has already seen the test screening of the movie says that when Godzilla and Ghidorah have their first fight, the military uses a weapon called the "Oxygenator" It's pretty much the modern-day Oxygen Destroyer. The damage that is done to the two fighting Kaiju (Or Titans, whatever) is unbalanced. Godzilla is badly injured from the weapon, while Ghidorah is unscathed. If this happens towards the start of the movie, it may show Godzilla slowly recovering throughout the movie. When the final fight begins, Godzilla may be weaker than he was when he first fought Ghidorah, ultimately leading to a possible burst of power from either Mothra or Rodan.

 I don't really think that Kong is gonna team up with Godzilla in 2020 to fight Ghidorah again. If you didn't know already, Mike Dougherty tweeted a picture of the Oxygen Destroyer. Long story short, people are thinking that Destoroyah is going to appear as the main villain in the film, and after fighting each other already, Godzilla and Kong will team up to fight Destroyah. 

He'll grab him by the tail(s) and throw him back into outer space

@Godzilla's tail I wish! I wouldn't mind a final wars/ showa level of OP tbh.

Godzilla seems to have much fuller dorsal plates and in the final shot of the second trailer is basically larger than Ghidorah in terms of musculature; Ghidorah's necks look like noodles in comparison.

My guess is Goji will get a powerup from a nuke or something and grow stronger permanently, just like in vs. King Ghidorah and FinalWars in the last fight

i hope in it's own way it goes down similar to the fight between toothless and the bewilder-beast in the sense that Godzilla establishes dominance over Ghidorah (preferably in a similar fashion to how real reptiles such as lizards and crocodiles do such as biting on the snout and neck) and after proving he is the alpha the Mothra and Rodan submit to him then proving his ability to handle Ghidorah the others join in just to finish Ghidorah off.

I'd imagine G will do some kind of head rip off for Ghidorah...he does have three after all...he can get by w/ two heads. :)