Ben 10 belongs to Man of Action Studios and Cartoon Network

Monster Hunter belongs to Capcom

RWBY belongs to Rooster Teeth and Monty Oum

I only own my OC and Ultimate forms

Dedicated to Braedey95 and CorJayNelson

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Opening - Ben 10 Ultimate Alien Theme

https://youtu.be/cxUbzV__dUI

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At Beacon Academy, Team JNPR was busy preparing for their morning mission by getting a good night's rest.

Jaune turned over in his bed, mumbling. "...Waffles. What? No, Pyrrha, not right now." Suddenly his scroll rang, shattering his rest. "Hello?" But on the other end, there was nothing but static before the call cut out.

Jaune looked at the caller ID. "Ruby?"

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In the morning after a filling breakfast of waffles, which Jaune was really excited to see for some reason, he shared his concerns about the situation with his team and Emma as they walked to their airship.

"I'm sure they're fine." Pyrrha said.

"You think?"

"Probably a butt dial." Nora said, skipping.

"Team RWBY has always performed exceptionally in the field and they have Jack, as well who is also a skilled fighter." Emma noted. "You guys should be focusing on our own mission."

"We're going to be deputies!"

"I don't know," Jaune said. "I just got this feeling..."

"Jaune..." Pyrrha said.

But then she was interrupted when the emergency warning system went off in Vale. It didn't take long for the alarm to go off at Beacon. Team JNPR looked around surprised while Nora and Emma shielded her ears.

Jaune made a split-second decision. "We're changing our mission. Everyone on board." As JNPR boarded the airship, Jaune turned to Ren. "We'll make it out to that village another time." He said.

Ren nodded.

"Take us into the city!" Jaune said to the pilot.

As the airship took off, Cinder, Emerald, and Mercury came out into Beacon's courtyard. "You don't think...?" Emerald said.

"Sure, looks like it." Mercury said.

"But that's still days away!"

"So... what do we do?" asked Mercury to Cinder.

Cinder said nothing as she watches Emma transforms into Omnivoracious and goes Ultimate Omnivoracious and flew at top speed.

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Team RWBY and Jack are surrounded in the middle of the pavilion by Beowolves, Ursai, and a massive King Taijitu. The King Taijitu unleashes a mighty roar, signalling the Grimm to attack. Ruby Rose plants Crescent Rose on the ground before kicking away the Grimm, Yang Xiao Long propels herself upwards, performing aerial bombardments with Ember Celica on the Grimm before three Giant Nevermores send her crashing to the ground. Blake Belladonna slashes a Beowolf with Gambol Shroud before firing on the other approaching Grimm. Weiss Schnee slashes three Beowolves, before summoning a glyph to conjure up an ice blade. Jack turns into Zinogre and uses his thunder balls to blast all the ones about to attack him.

"Who wants some?!" Zinogre yelled at his opponents. He slaps the MonTrix symbol and turns Rathalos before twisting the hourglass symbol in a vertical position.

His body got bigger, his spikes and scales grew thicker and longer, his red color became crimson red with dark brown and cream mixed alongside.

"DREADKING RATHALOS!!" The Darkness Lord Wyvern roars out as he flies and bombarded the Grimm with his red fireballs. While the impact didn't kill all of them, they stuck on the ground and exploded, the explosion themselves killing the Grimm.

Yang, back on the ground, sends several cars flying towards the Grimm. As Ruby finishes slashing at a Grimm, she notices the King Taijitu ready for the attack, until she also sees Nora Valkyrie flying on her Magnhild hammer towards the King Taijitu, slamming it on the head and killing the beast.

"Nora Smash!" Nora yelled as she slams her hammer at the Grimm.

After Nora lands back, Jaune, Pyrrha Nikos and Lie Ren soon follow with Ultimate Omnivoracious behind.

"Let's move!" Pyrrha said as she, Nora and Ren all jumped into battle at full speed, leaving Jaune behind as he still hasn't learned that trick. He groans in irritation and decides to just march into battle.

"Okay, who's first?" Jaune taunted. However, something big landed behind him. Jaune turns around to notice a giant Ursa standing behind him. It roared angrily at him.

"Oh-oh-okay, you're first, huh? Okay, no, that's fine." Jaune nervously said.

Pyrrha was dealing slashes and blows on some Grimm that surrounded her. She manages to deal with them with ease. After her fight, she spots Jaune being approached by an Ursa. This worried her.

"Totally fine, done this before, done this before..." Jaune said to himself and sighed...then with a mighty scream, Jaune slashes the Ursa several times before it falls. Pyrrha smiles, as she notices his improvement.

A Beowolf jumps behind Jaune, but Ultimate Omnivoracious headbutts the Grimm away. He looks at her and she nodded. "You're welcome."

Suddenly, high above the air, a fleet coming from the Atlesian Military, now arrives, consisting of dropships deploying Atlesian Knight-200 units and the flagship of James Ironwood.

As Team RWBY and Jack looks up in the sky, an Ursa takes the opportunity to attack Ruby from behind. However, it is gunned down by a Bullhead's machine gun. As the robotic Knights deploy, they start gunning down the Grimm. Two of the Knights are stampeded on by a Boarbatusk, but a separate group of three Knights fire on an Ursa, and another Ursa has fallen from a Knight's punch.

Out of the opening comes Zwei, followed by Dr. Bartholomew Oobleck in a damaged Atlesian Paladin-290. As Zwei headbutts a Beowolf, a shadow looms over him and he looks up to see an airship arriving, dropping off Team CFVY and Professor Peter Port. As Yatsuhashi Daichi is surrounded by a pack of Grimm, he swings his mighty greatsword on the ground, unleashing a shockwave. Velvet Scarlatina and Fox Alistair respectively kick and punch the Grimm, and Fox unleashes a combo of slashes and punches that make a spiked Ursa explode, impaling the nearby Grimm with its spikes.

Coco Adel, walking up to the battlefield, gives Fox a light pat on the butt. "Nice hustle, Fox. Good job." She said in a rather teasing tone.

Coco approaches a large Beowolf.

"You just destroyed my favorite clothing store. Prepare to die." Coco said to the monster in front of her.

The Beowolf attempts to attack but Coco swats away its right hand, then kicks the Beowolf in the crotch. She, as it falls to the ground and looks at her, leans down and slams her bag onto its head. She effortlessly swats away more beowolves, and the rest of Team CFVY resume fighting. Velvet steps forward, about to open her box.

Coco stops her. "Hey, come on, you just spent all the semester building that up." She said, stepping forward herself. "Don't waste it here."

Coco then transforms her handbag into a giant minigun, and starts firing, slaughtering the advancing horde of Grimm, including a Death Stalker and three Nevermores. The now dead Nevermores all crash into the buildings behind team CFVY. Coco just walks forward like nothing happened.

Seeing that no matter how powerful they are, these things keep on coming. So Dreadking Rathalos thought of one last solution. Ultimate Omnivoracious lands beside him.

"Are you thinking what I'm thinking?" Dreadking Rathalos said, looking at his girlfriend.

Ultimate Omnivoracious smirked. "Yep." She said as she turns into Tyrannopede.

Dreadking Rathalos slaps the MonTrix symbol and Tyrannopede slaps her Nemetrix symbol, the former changing into a newer form, whilst the later went Ultimate. Team RWBY, JNPR and CFVY, alog with a few teachers, noticed the light blue and crimson red auras and they knew Jack and Emma are going through new transformations.

Jack is now a two story tall black dragon with horns on its head the resembles a crown with red veins glowing all over its body. It has spikes coming of out its chest, wings, legs, knees and tail. It had the MonTrix symbol placed on its chest.

"ALATREON!" The Blazing Black Elder Dragon roared, with thunder crackling in the background.

Meanwhile, Tyrannopede grows until she is the size of Disufiroa. Her scales became red with her underbelly yellow. She had now three-fingered hands in her 6 arms, which are just as big and muscular as her legs. Her tail had Stegosaurus spikes with the tip being an Ankylosaurus bone club. Her back is covered in blue Ankylosaurus like armor with a Kentrosaurus spikes on her head. Her head is now that of a Spinosaurus with two horns instead of one. (1)

"ULTIMATE TYRANNOPEDE!" She roared, her voice booming for miles.

The sight of the titanic monstrosities struck awe and fear for the teams and teachers, but is was a horrifying sight to see for the Grimm.

Alatreon's red veins turn blue as frost came out from his mouth and electricity cackles from his body. "Now you face the might of a living natural disaster!" He flies as he spins and flies before launching big ice crystals, destroying Grimm dumb enough to not move away . He then summons lightning as his "crown" glows white to incinerate more Grimm.

Ultimate Tyranopede started crushing and chomping on Grimm that crawl towards her body. Nevermores tried their sharp feathers, but those only bounced off her armor. She roars before two purple energy came from her horns and fired two purple energy beams, disintegrating them.

"I can fire energy attacks now? Sweet!" Ultimate Tyrannopede said.

Alatreon swipes with his black and red energy-fused claws at the ground and launched a fireball, which turns into a tornado that sucks up and burns Grimm.

After a few minutes, every Grimm had been annihilated as Ultimate Tyrannopede turna back to Tyrannopede and finally as Emma. Yang, approaching, Alatreon, punched him in the leg before shaking her fist as his skin is quite tough. "You didn't tell us you had a form this powerful." She said.

Alatreon just shrugged. "Alatreon is elementally unstable. He can harness the powers of the Fire, Ice, Dragon and Thunder Elements. But being elementally unstable, he has yet to truly wield those elements to their potential." He explained as he turns back as Jack with the MonTrix symbol beeping pink, indicating it is recharging.

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A few Atlesian Knights fished through the wreckage of the train and pulled out Roman Torchwick along with whatever White Fang they could find.

"Oh, I can't believe you've caught me." Torchwick said as he was taken into custody. "You've really shown me the error of my ways." But as a knight placed him in handcuffs and put a hand on his head to lead him into the airship, Torchwick turned bitter. "Hey, hey, hey! Watch the hat!"

"Torchwick getting arrested is too easy." Emma said.

"And he sounds like he gonna get out soon." Jack added.

"No this time he'll stay lock up." Weiss sounding sincere on her words.

With the authorities tidying up the chaos, and subsequent to having been formally dismissed by Doctor Oobleck with his congrats on an occupation well done, Team RWBY and the two shapeshifters made a beeline for Beacon.

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Now sitting at the edge of a cliff to watch the sunset, they all talked about what happened earlier.

"Well, we did it." Yang said

"We did it." Blake repeated.

"If we don't get extra credit for that, I'm gonna be seriously disappointed." Weiss complained.

"Weiss, a two-headed snake literally crushed a bakery. I wouldn't count on it." Jack said, Zwei on his lap, barking after Jack said that.

"Plus, I mean, we didn't solve everything. A lot of people were hurt, and we still don't even know why they did this, or who that mystery girl was." Ruby pointed out.

Weiss shook her head. "Well, not every story has a neat and tidy ending."

"We might not have all the answers, but we do have a lot of dangerous people behind bars. And I think that's something we could be proud of." Blake said.

Ruby nodded. "Yeah! And if anyone tries something like this again, we'll be there to stop them."

"Yay, teamwork, camaraderie, good guys, go team, alright, good job... So, what now?" Yang said, lying down on the ground.

"I'd suggest training for the tournament, but I guess we have that covered at this point." Weiss replied.

"So then..." Blake said, trying to come up with something.

Ruby continued. "Uhh... Time for bed?"

"Oh please,yes/Absolutely/I'm going to sleep forever." Weiss, Blake and Yang said simultaneously.

"Well, me and Jack are gonna go out for a little longer." Emma said as Jack put Zwei down.

"Aren't you guys a bit tired?" Ruby asked.

Jack shook his head. "Fighting criminals has given more resistance to sleep." He jerks his thumb at Emma. "And Emma can last longer thanks to being a human."

"Anyways, see you guys later." Emma waved as she and Jack said goodbye to Team RWBY.

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Cinder, Mercury and Emerald meet discreetly at a rooftop.

"All in all, I call today a success." Cinder said.

"Those stupid kids really made a mess of things." Emerald said.

"Yeah. A lot of Faunus didn't make it out the tunnels. You still think the White Fang's gonna listen to us?" Mercury pointed out.

"No." Someone said. They all turned to look at the source of the voice and saw.....

Adam Taurus.

"...but they'll listen to me."

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Ultimate Tyrannopede

Species: Unknown. The predatory species of Vaxasaurians and Evolved Vaxasaurians (Humungousaur and Ultimate Humungousaur's species)

Abilities: Indestructible armor, powerful jaws, an fire energy beams from either her horns or mouth, spiked and bony tail

Weaknesses: Slower, still vulnerable to the Hephaestan neuro grip

1. Ultimate Tyrannopede's appearance belongs to "myzor king of war" from FanFiction, so credits go to that guy.