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Haven't read any of the comics so just going off movie:

First: Meltdown Godzilla(Godzilla vs Destoroyah)

Last: Showa, but more specifically to narrow it down I'd say either the one in Son of Godzilla or Ebirah, Horror From the Deep.

I'm surprised Legendary Godzilla is so high up. A lot of G-fans don't find him particularly threatening compared to heavy hitters like Heisei Godzilla. Glad to see that, though, since he's tanked things that make many others likely wouldn't be able to take.

Too bad the Rage Across Time and In Hell iterations aren't present. Those guys would've easily topped this list.

@TheGMan123 Do you know when they'll be selling the Rage Across Time book on amazon? As of now it's only for kindle

As for the list I have some gripes with it, but I'm not mad at you or anything. For me I would have put them in this order...

20. Original Minilla 

19. Final Wars Minilla

18. Final Wars Zilla

17. Zilla

16. Hannah Barbara Godzilla

14. Zilla Jr

13. Godzilla 54

12. Godzilla Jr

11. Godzilla 2000

10. Showa Godzilla

9. Kiryu Godzilla

8. Shin Godzilla

7. Legendary Godzilla

6. Dark Horse Godzilla

5. Marvel Godzilla

4. GMK Godzilla

3.Burning/Heisei Godzilla

2. Final Wars Godzilla

1. Rulers of Earth Godzilla

I'll stick with cinematic versions and omit the offspring and imitators. Not specifically in order, but mostly giving it the tier rating.

Top Tiers
Heisei Godzilla (Burning)
Final Wars Godzilla
Heisei Godzilla (1990s)
GxM Godzilla
Heisei Godzilla (1980s)

Mid Tiers
GMK Godzilla
G2K Godzilla
Kiryu Godzilla

Low Tiers
Shin Godzilla
Legendary Godzilla
Showa Godzilla
First Godzilla (1954)

I think the most powerful Godzillas would be: Burning, Final Wars, Shin (due to his destructive capabilities), Legendary, GMK, Heisei and Marvel. Not necessarily in that order, though.

Didn't they state that Shin Godzilla was the strongest?

Toho claims that the 2016 Godzilla is the strongest incarnation, yes. But they also said the same thing about the 2014 Godzilla at one point.

Neither one add up and is likely just used for marketing purposes.

Zilla ('98), FW Zilla, and Zilla Jr. shouldn't be on the list, they're no longer considered as Godzilla.

Last time I checked G 2014 ran away from missiles, then fainted after killing two monsters who had no powers. I rank him weakest until I see what he does in KOTM. 

Final Wars is the toughest hands down. Shin is close tho, even though I hate him. Every other incarnation falls somewhere in the middle.

 Special mention: Burning Godzilla and GMK Goji

I'm honestly surprised how much people don't consider G2014 powerful XD

He took a nuke to the face for crying out loud and walked away fine. And, being from before the Permian era, he survived both the Permian extinction (an event that eliminated 90% of all life on Earth) as well as the KT Event (the extinction that wiped out all life bigger than about 55 pounds). Then he faced off against MUTOs, a species that literally evolved to be a parasite to his own species, for 3 days straight with no rest in between. Furthermore, even though he obviously didn't like getting hit with missiles via the military in the one scene, he certainly took absolutely no damage from them; not a scratch on his body from that encounter at the bridge. The only time he actually bled was again when he faced the animals that evolved to be a parasite to his species alone.

I don't really see how that all calls for a weaker Godzilla incarnation label. Seems pretty mid-tier at the very least.

Number1GodzillaFan,

"I rank him weakest until I see what he does in KOTM."

I honestly do not see how LegendaryGoji is any weaker than ShodaiGoji or the Showa Godzilla, in general.

I'd still rank Godzilla '14 pretty low on the totem pole, especially compared to some of the later Godzillas from Toho. Sure he's a survivor, but surviving doesn't really add up to great power.

And he did not fight the MUTOs for three days straight with no rest. He fought one for one night and two for another. He casually swam the rest of the time which should be no issue for a creature who has been swimming underwater for much of the previous 60 years.

But if surviving doesn't add up to great power, then how does Godzilla from GvM rank up there? His greatest feats were surviving a black hole (falling into the surviving category) and roasting Megaguirus and her swarm, and yet he's a top tier?

Like I said, the only time G2014 physically showed damage was when he was getting double teamed by the MUTOs. Other than that, he was on top of every damage-dealing encounter he was in in 2014. The first fight with the Hokmuto he walks out unscathed, the bridge scene he walks out unscathed, the second fight with Hokmuto he walks out unscathed, and in the opening fight with Femuto, Femuto can't even get a hit in; she's too busy getting grappled and tossed around by Godzilla. Only when he's double teamed does he actually start to face trouble in the movie. Then immediately when they stop double teaming him, he outright kills them with a single tailswipe and an atomic breath down the throat. 

I'm not saying G2014's the most powerful out there (Final Wars is more powerful, Burning G is obviously more powerful, etc.) but I really don't see how he could be so low down the pole when we have other incarnations that hardly hold their own in a 1 on 1 fight, let alone be double teamed by organisms that evolved specifically to kill them.

I think surviving a black hole is a little more unconventional than a nuclear bomb. In any case I think the GxM Godzilla's greatest "feat" (I can't begin to explain how much I despise that word with all my heart, soul and mind) is his impressive aerial leap onto Megaguirus.

And with by the same logic you use, the Showa Godzilla may as well be one of the stronger ones since he took on Titanosaurus and MechaGodzilla, an arguably more deadly combo (alien technology anyone?) and still came out on top. Being double teamed is nothing new to Godzilla, but it doesn't exactly equate power within context or comparison of others.

I'm not necessarily saying G'14 is weak, all Godzillas have proven they're tough, but I'm absolutely unimpressed with his abilities in comparison to other incarnations--By far.

Surviving a nuclear blast point blank is still an accomplishment not to blink at, for sure. The core of a nuclear explosion can reach temperatures of around 100,000,000 degrees Celsius; the temperature of the Sun's core.

And Showa Godzilla only got the upper hand once they stopped double teaming as well; as Titano was hit with the soundwave cannon and his mind control disfigured.

I think what really need to do if we truly want to deduce which Godzilla is stronger over the other is consider a number of variables instead of "well this one could do this and this" or "this one survived this".

I think it would be more accurate if we could somehow deduce A) The power of their special abilities (Atomic breath, pulse, etc.) B) Physical strength and agility C. Durability D. Stamina E. How tough their opponent was and how the battle played out. For instance, defeating Heisei Rodan is a little less impressive than defeating Showa Rodan. That kind of thing.

Cause I mean, there's questionable stuff all across the board. For instance, does one consider the red spiral ray a trait the 90's Godzilla owns or not (since it technically was given to him; it wasn't an initial trait)? Does a Godzilla getting tossed around and knocked down show signs of a weak Godzilla or a tough opponent?

See it's questions like this that keep me up at night XD
I kinda feel like it's easy to do a list like this off the top of the hea

And the only reason Godzilla won against the MUTOs is when they stopped double teaming against him when Ford blew up the nest.

It should be easy to do a list like this off the top of our head, because it's ultimately a pretty dumb conversation to begin with. Just go off what we see in the films and anything extra that source books can add, sure take it. But it's really not worth wasting time and deducing into the A, B, C and D that you seem to be losing sleep over. I call it like I see it and I see other Godzillas to be far more impressive than the 2014 one.

Anyone who says the Mutos are tough need to watch Terror of Mechagodzilla, GMK, Godzilla 2000, you can use basically any Toho movie and pin G '14 and I'm afraid he's going to end up dead. I have a feeling he will prove himself in GKOTM. I think he will be in for the fight of his life against this new Ghidorah, who may be the most powerful Ghidorah yet. Especially if they intend for him to be a villain in GvK. 

@GMan.   Right; G2014 came back after the double teaming stopped. My point is that many Godzillas do not fare well when double teamed. G2k got double teamed and suffered for it, KiryuGoji got double teamed and only started coming back once either Mothra or Kiryu was down, ShowaGoji got double teamed on multiple occasion and never fared well with it, G2014 didn't do well of course when double teamed, and even HeiseiGoji didn't do well when he was double teamed by Mothra and Battra. Heck, the instant they teamed up to stop him, he lost. The only Godzillas that have been double teamed and didn't seem to be bothered by it was GMKGoji and FinalGoji. That's it. All the others got kicked and tossed around until it was one on one again.

The MUTOs are pretty serious adversaries. Sure they aren't up there with the likes of King Ghidorah, Destoroyah, or Biollante, but they could easily take down a number of Toho Kaiju like Baragon, Anguirus, Ebirah, Kumonga, I can see them taking down Orga, etc. Heck their EMPs alone render any Mecha useless (and probably Gigan too cause cybernetics), so that means even the likes of MechaG and MechaKG would probably go down if they fought them.

My point is that the Godzillas in these movies did not fight adversaries that were equal in strength all together; not to mention the two that never had an opponent at all. Shin too seems to be universally ranked sort of low according to many, and yet he easily has the most powerful atomic capabilities of all the Godzillas considering his breath's lightsaber-like qualities. That's something even BurningGoji would have a really hard time with.

My sentence there in an earlier comment seems to have gotten cut off. I'm saying that it's easy to do a list off the top of the head, but to be more accurate, we would have to look into more stipulations and consider more input than just "well this Godzilla did this thing this one time" or "this Godzilla survived this".

To sum up, it's not JUST a boiled down list of "X survived this whilst Y didn't", or "X lost here whilst Y didn't".

Power can be attributed to many different facets of each individual Godzilla, and not always in clear-cut ways. Heck, breaking down the physics of it all is challenging enough in and of itself, since showings that SEEM impressive might not actually be so upon further dissection, and vice versa.

For example, that black hole in Godzilla VS. Megaguirus isn't a true black hole, since it clearly didn't behave like one. If it did, Earth would've gone POOF, or at least Japan, so we have to judge its gravitational singularity based on what we DID see it do, which isn't too different from a nuclear detonation in terms of destructive potential.

That's just one example, one in which context and proper knowledge go hand-in-hand in these fictional debates. If my time at Spacebattles has taught me anything, you gotta dig deeper before you make the call.

Meltdown Godzilla(Heisei 1995) can possibly blow up an entire planet! That's pretty powerful. However he would be destroyed before the planet is. But if we are considering "Zilla" as a Godzilla in this topic, then he is by far the weakest. Cant even take on some missiles? what a pathetic excuse for a monster that is called Godzilla. its like we made a superman movie but superman cant take a bullet, not very super right? The people involved either didn't have enough respect for the character they were trying to portray or they had a huge hard-on for American artillery and thought, there is no way any giant monster can take the good old U.S. of A. artillery to the chest and live. Im glad Zilla was knocked out in Final Wars. It is the biggest middle finger Toho could give to our movie studios over here.

^

See? This guy understands.

^Few do. Clearly.

 You'd be surprised. JK.

I think that IDW and GMK got a lot less credit then they derseved here. As for IDW, we have to remember Godzilla in Hell. Here he is shown to be especially resilient, even with most of his powers stripped from him, he was shown to be remarkably powerful. As for GMK, he is one of the only ones who has died on screen, and the second to "come back". The first being Zilla '98 in Godzilla the Animated Series.