It's time for the King of the Monsters to face off the King of the Dragons and well do an analyse and see who would win

Acnologia vs Godzilla is not as easy as some may but let's see how it will go.

Intelligence: Godzilla's intelligence depends on his incernation,he has been shown communicating with other Kaiju as well as mostly behaves like an animal. Acnologia's intelligence is most likely that of an avrage human even in his dragon form. I'll give this to Acnologia

Fighting experience: It is unknown how Acnologia fought in his human form but he must considering how many dragons his killed in both forms means his got a lot of experience. Godzilla like Acnologia has fought and defeated many creatures and beings such as aliens,mutants,magical creatures,machines etc. Cause it's unknown how many battles Acnologia had,I'll give this to Godzilla.

Strength: Acnologia has shown to have great strength able to defeat Makarov in his titan form with little effort. However I'll give this to Godzilla not because his larger but because has been shown lifting creatures larger then himself (such as Kaiser Ghidorah) with relative ease and has been shown matching Thor in strength.

Speed: I'll give this to Acnologia,cause Godzilla has never shown any feats that go with speed. Godzilla mostly relies on his strength and fire power to win.

Durability: Acnologia has been shown taking massive punishment and has recovered fairly quickly. But I'm giving this to Godzilla for the simple fact that he can regenerate.

Invulnerability: Acnologia is incredibly hard to damage he has took the combined attack of Fairy Tail including the combined attack of three Dragon Slayers (the only type of magic that can harm a dragon) and emerged without a scratch or any sign of injury or damage,he also took Igneel's full force fire breath head on and emerged unharmed. But like bore I'll give this to Godzilla because he took a meteor (that could destroy the planet) to the face and didn't even flinch,he was able to withstand attacks from the Avengers,his fallen into a volcano and survived a black hole.

Energy projection: I'm going to say that this is a tie, both Godzilla and Acnologia have serous fire power. Acnologia used his Dragon Roar to destroy a large island,Godzilla used his red spiral ray to kill Spacegodzilla,Kaiser Ghidorah and slow down a meteor.

Feats: Acnologia has slaughtered countless dragons,defeated the entire fairy tail guild,went toe to toe with Igneel and destroyed Island. Godzilla went toe to toe with the avengers,survived a meteor without a scratch,has 44 victories,went to the moon and back,has destroyed foes larger and more powerful than himself like Spacegodzilla,Kaiser Ghidorah,Biollante and Hedorah.

The goverment has created a device that shoots portals and were able to successfully send Godzilla to another dimension.

Godzilla wakes up to find himself underwater,he senses a something outside and begins to swim to the Acnologia had just landed on the island and gave an ear shattering roar. All of Fairy Tail were looking at him with shock.

But suddenly something massive begins coming out of the water,everyone's attention turned to the massive wave even Acnologia's attention was brought to the new comer. Finally Godzilla emerged from the water and close to the island,he easily dwarfs the black dragon in size,in fact Acnologia was half Godzilla's size.

"What...is that ?" Gray managed to say while looking at Godzilla

"It's even bigger than the dragon" Erza could say in shock

Godzilla now let out an even more powerful roar. Acnologia roars again,then opens his wings,takes flight and charges at Godzilla.

Acnologia hits Godzilla who absorbs the impact but manages still stand. Godzilla gets a hold of the dragon,then uses his powerful claws to slash Acnologia in the chest causing the dragon to roar in pain. Acnologia lunges forward and bites Godzilla close in the neck. Godzilla pulls Acnologia off and tosses him on the ground.

"Why are they fighting ?" Natsu asked

"I don't know but we better get out now while they both are distracted with each other" Gildarts ordered

Acnologia gets up,roars and charges at Godzilla again. But Godzilla this time avoids his attack and uses his massive tail to slam the dragon like a baseball bat hitting a ball. Sending him crashing in the ocean and making a big splash.

"It...won ?" Lucy asked in shock

"No...it's not over yet" Gildarts said while looking at the battle

He was right as Acnologia emerged from the water and was incredibly angry at Godzilla. Acnologia flew up and began gathering energy.

"Everybody get down" Gildarts yelled at his team

Acnologia had unleashed his Dragon Roar at Godzilla who took the attack head on. Then BAAM there was a massive explosion making a very powerful earthquacke.

"Your Kidding ! It's that powerful ?!" Natsu yelled while covering his eyes.

After it was done,Acnologia stood there looking at the crater it had made,thinking he won...but he has no idea how wrong it was. Godzilla slowly emerged behind Acnologia from the water now he was very angry,he let out another roar causing the evil dragon to look behind him in shock.

"It's...Alive" Gray said in shock.

Now it was Godzilla's turn. The spikes on his back turned hot red instead of blue. He looked at Acnologia who was prepared to use the Dragon Roar again. Godzilla fired his Red Spiral Ray and Acnologia fired his Dragon Roar. The two blasts colided making a powerful explosion...however shortly after the explosion The red Spiral Ray overwhelms Acnologia's Dragon Roar and begins coming towards the Dragon. Acnologia could only look in shock as the Blast came to him and hit him dead on.

BOOOOOOM

It made a massive explosion even more powerful than the one Acnologia made.

"Do you think it's over ?" Asked Laxus

"I don't know" Gildarts Answered

After the smoke cleared it showed Acnologia...with his head missing. The fairy tail guild looked in shock as Acnologia's headless body fell in the ocean. Godzilla let out a roar of victory,then turns his attention to the mages.

"Be careful if it can kill that dragon like that we are in serous trouble"Gildarts warned

However instead of attacking Godzilla tuns his back,went in the water and began to swim away.

Thank you for reading this and hope you enjoyed.