My Little Pokemon: Dragon's Ascent

-Canterlot, Celestial Wing-

Celestia walked slowly, a noisy yawn escaping her throat as she made her way to her chambers. All of the fuss in sorting out strange new ponies from a distant realm from her own had not gone without tiring the celestial alicorn, and she was eager to reacquaint her head to a pillow and wings to a blanket.

Ushering another yawn, the mare spotted the door to her bedroom down the torch-lit hallway and quickened her pace slightly. As she lifted a hoof to the doorknob, she heard a faint whisper in her ears and felt a chill breeze against her fur and feathers.

Swiveling around, Princess Celestia spotted, for a brief, glancing moment, a black, crystalline shape roll into the shadows, a soft hiss seeping out of its form.

"Who goes there?!" she called out, letting a faint golden light envelop her horn. "Show yourself!" Celestia ordered, clapping her golden clad hoof against the floor.

Before she could do anything more, a dark shadow cloaked a torch and snuffed the light that it emitted, darkening a small portion of the hall. The shape, as it moved, Celestia could tell was vaguely equestrian, but made out of some kind of crystalline material. She watched in a mixture of curiosity and growing fear as the shape approached, dousing the light from each torch in shadow as it moved.

The equine, whatever it was, stopped feet from her, a jagged black horn crackling and similarly constructed wings fanning themselves. The alicorn uttered another gentle, almost soothing hiss as Celestia looked over its form. It was indeed an alicorn, but looked like its body looked like it was constructed of aerenth crystals, the same deep black that the mare recognized from King Sombra's reign in the Crystal Empire. Blue pupils surrounded by crimson red glared at her as elbow mounted gems of black and white pulsed with a faint light.

Celestia found herself captivated by the odd pony and unable to move despite the fear that rapidly grew withing her. Straining to move, she was unable to stop the equine as it dissolved into shadow and enveloped her form.

She couldn't even scream for help.

-Crystal Empire-

Rayquaza let the sweet smell of hot chocolate seep into her nose as she sat huddled next to Giratina, Prince Shining Armor and Princess Cadence across from them. "Oh, this is so much better," the Sky High Pokemon murmured with a slight smile. "Thank you for this," she said to the Crystal Rulers, nodding at them before taking a sip of her cocoa with a satisfied sigh.

Pikachu had, since they made it to a warmer location, had himself perched where he usually did between her broad head crests, snoring lightly.

"Think nothing of it," Cadence chuckled. "You looked frozen to the bone out there, and your friend helped to put you on our good side," the bubblegum pink alicorn continued. "Anyway, I take it that you're Rayquaza, Demigoddess of the Skies?"

The mare shot a look over to Giratina with a cocked brow. "How much about me DID you tell them?" she asked the Renegade Pokemon, flushing in the cheek slightly at both the cocoa and Cadence's words.

"Enough for them to get a sense of who you are," Giratina smirked with a nod.

"Like how you fought off two of the most powerful beings of your home," Shining Armor interjected. "How'd you do it, anyway? You seem like you would know more magic than the brute strength Giratina explained."

"I have my ways," Rayquaza replied, firing a half-second glare at her friend.

-Canterlot, Yveltal's Chambers-

Yveltal growled under his breath as he sat on his haunches across from Xerneas, lips curled back into a snarl as he glared at her with so small amount of hatred, and no small amount of annoyance. The castle's monarch was forcing him to try and get along with his greatest foe. Like that'll go well for anybody, the twin crested pegasus thought to himself with a sneer as Xerneas inhaled deeply, eyes shut.

"Yveltal," she chided, "I don't here you breathing," Xerneas continued, taking a peek at the pegasus stallion.

"This is stupid," the Destruction Pokemon grumbled, rolling his eyes before inhaling sharply and quickly.

"Anger leads to the dark side," the Life Giving Pokemon joked in a strange voice, remembering a human movie for a moment with a smile and giggle.

"I OWN the dark side!" Yveltal barked, leaping to his hooves with a snort.

Before Xerneas could reply, a cold breeze swirled under the crack of the closed door and ruffled Yveltal's mane. Even to a Pokemon such as himself, the breeze felt as though it had a touch of evil.

"Did you feel that?" he asked, his typically angry demeanor seeping away.

"No?" the she-elk acknowledged, lifting her eyelids and rising to her hooves. "What did you feel?" she questioned, looking over at him.

Yveltal entertained dark thoughts for a moment, a mischievous smirk crossing his muzzle. "Something with a lot of hatred in it," he said, leaving his room.

Xerneas let her eyes widen for a moment before she followed the avatar of death itself out.

-Moments Later-

Yveltal was flying down the hall, eyes never straying away from the milky white and crystalline black shape that darted amongst the hallways. A loathsome sneer twisted across the stallion's face as he summoned a sphere of dark energy before him and launched it forward. The Shadow Ball raced towards its target with grim accuracy. Before it could strike his foe, the shadowy figure dodged to the side, sending the sphere of dark energy through the walls of somepony's room.

But Yveltal didn't notice. He had hardly noticed that his attack had even missed its target. The Destruction Pokemon's only motive was that this newcomer would provide a good amount of life energy.

Careening around a corner, the stallion, lunged toward the equine, jaws bared as he landed on top of it. The alicorn he struggled against was thrown down and forced against the floor, where Yveltal spread his broad wings, which had now taken up a strong glow as he prepared to absorb its life energy.

Before he could do anything of the sort though, Xerneas planted her hooves against his rib cage, slamming him against a wall.

"What the hell are you doing?!" Yveltal shouted with fury brewing in his eyes as he recovered, the crystalline figure making its escape. "I had 'im in my grasp!!"

"You can't be so quick to attack!" Xerneas barked back.

"What are you thinking?! That thing was NOT worth protecting. Didn't you feel that?!"

"Yveltal," a voice like a chime interjected. The stallion's ears feel flat as he winced. He knew the voice as well as any legendary Pokemon. "You were right to try and stop it. You were NOT right in trying to absorb its life force, though," Arceus scolded as she approached him from behind. "Necrozma has been troublesome since his creation. But I never expected he'd go so far as to harm beings from this world," the alicorn exclaimed. "Also, regardless of Necrozma's arrival, I don't particularly appreciate the hole in my wall."

The pegasus grimaced, dipping his head slightly. "Sooooo... What are you going to do about what's-his-face?"

"I'm going to have Dialga scout things out. Knowing Necrozma, he's gone after the celestial's of this world. Those being the princesses. You two, on the other hand, are going back to your separate chambers until I give the okay, do I make myself clear?"

"Yes, Master," Yveltal grumbled, rolling his eyes.

"Do I make myself clear?!" Arceus said again.

"Yeah, sure... Whatever," he shrugged again, turning his back on the alicorn to return to his chambers.

"Keep an eye on him for me," Arceus told Xerneas as she turned to walk off. "Goodness knows what he'll do when nobody's paying attention."

"You can count on me," Xerneas smiled, turning with a bow.

"I know I can," the Creation Pokemon said in a soft voice. When Xerneas was out of sight, the mare's typically calm demeanor was broken, replaced with that of worry. Necrozma was too dangerous to be left alone for too long, and part of Arceus was thinking that maybe Yveltal should have been allowed to absorb his energy, however dangerous it could have made the pegasus as a result. Yveltal was reckless and unstable, which was how one would be able to bring him down. Necrozma, on the other hand, was crafty, always thinking about his next target, which was what made him so much more deadly. And the fear of the Prism Pokemon already having taken control of one of the royal sister's bodies was not absent from Arceus's mind as she trotted down the hall.

The mare had been traveling for a few minutes when she nearly collided with the Temporal Pokemon himself as he exited the celestial wing's training room with a heavily packed saddlebag over his shoulders.

Arceus skidded to a halt before the unicorn stallion, a wave of relief washing over her at the notion of his aid. "Oh, thank the stars," she breathed, placing a hoof on his shoulders.

"What?" Dialga queried, lifting a confused brow at her panic.

"Dialga," she started, "do you remember Necrozma?"

"Curse his name, yes," the stallion acknowledged with a growl to his words.

"He's here. And I fear he's after the princesses," Arceus explained, looking about as she spoke as if he might be amongst the two now.

"He is?! How can you be sure?" Dialga asked, joining her in her motions and looking about him for a crystalline shadow.

"I saw him just after he had escaped Yveltal... You must help me find him before he does any harm!" the alicorn mare ordered.

"Right, okay," he said.

"Also, what are you wearing? Where's your armor?"

The stallion grimaced. "That Celestia character made me wear something less 'frightening'," he grumbled, rolling his eyes in annoyance. "So now I look ridiculous."

"Join me after you put your own armor on," Arceus said.

-Minutes Later-

Dialga came to his creator's side, adjusting his silver helmet slightly as Arceus shifted her view down to him. "Much better," she said. "Now let's go. You take the Lunar Wing. I'll take the Celestial side," the alicorn ordered, nodding in the said directions.

"Okay... Just one problem with that," the Temporal Pokemon obliged.

Arceus shot him a skeptical glance.

"I don't know my way around this place."

The mare sighed. "Then just look wherever you can."

"Right," Dialga said before turning to walk off.

Minutes Arceus had vanished from his view, a crystalline figure dropped down into his path. Well... Mostly crystalline, except for the milky white that was visible across most of the wings, parts of the legs, and some of the back. The unicorn stopped dead in his tracks with a slight growth of horror in his mind at what he was seeing. He recognized the being as both Necrozma... and Princess Celestia.

The stallion pushed aside fear to make way for determination, a glare crossing his face as he took up a battle stance. "I've faced harder challenges than you," he growled at the now black alicorn, his eyes glowing faintly as a blue-grey aura slithered from his eyes in tendrils.

"I seriously doubt that," a voice that seemed to echo all around him hissed as the equine before him leaped into the air, horn crackling with a mixture of gold and deep violet light.

"Let's have a go at it, then," he smirked before extending his jaws to make way for an aura beam.

The crackle of Necrozma's horn reached its zenith as a blaze of electric blue light tore forth from his foe's jaws, clipping the alicorn's wing. In response, Necrozma dropped down to all fours and launched a blast of shimmering gold and crackling violet from his horn, the attack striking Dialga square in the chest.

The stallion was blasted back a few feet, where he rolled to his hooves gasping for breath. Dialga looked down at his chest with a wince to inspect the damage. Luckily, the violet crystal embedded in his armor still pulsed softly against the silver. If that was to break, the result would be favorably compared to the end of time himself.

Necrozma fanned his crystal coated wings as he glared up at the Temporal Pokemon, charging another blast in preparation to put an early end to the duel.

Before Dialga could react, a small, green blur shot by him before resting itself on Necrozma's shoulder. "You're not being very nice, Mister," the changeling scolded Necrozma, tapping a hold filled hoof against his snout with a grin.

The crystalline alicorn snarled, slapping a wing against her back to shove her off.

The response was a minute flash before the changeling disappeared and reappeared on his other shoulder before looking up at Dialga. "Hiya, Steel!" she chirped with a slightly Asian accent as Necrozma growled and tried to shake her off.

Dialga looked on with a chuckle as Celebi buzzed about, tapping the stallion on the shoulder.

Each time, Necrozma would whip around to face her, only for the mare to appear a nanosecond later at his hooves. "Hey, what's that?" the changeling asked him, pointing a hoof at his crystalline chest. Looking down, Necrozma received a hoof to the chin for his actions. "Made ya look!" Celebi laughed.

Uttering a roar of irritation, Necrozma lurched forward and snatched the changeling's hoof in his jaws before twirling around and throwing her. She emerged unscathed, as a simple teleportation had her on all fours with little effort.

Dialga, nonetheless was quick to respond, and with a growl, he lunged on top of the alicorn, slamming his jaws down on the back of Necrozma's neck.

The stallion howled in pain, rearing onto his hind legs in response.

The Temporal Pokemon used this to his advantage, converging all of his strength into pulling Necrozma down. No matter how hard Necrozma tried to escape the throw down, it was no sell. Dialga was acting like a dead weight on his back. Just as the dark stallion was dragged down, the unicorn moved away, quick to place an unmoving hoof against his foe's chest.

"You, my friend, have made a dire mistake" the Temporal Pokemon growled in his face before throwing a hoof at Necrozma's jaw. As the tempered steel made impact, a crystalline shadow lunged from the alicorn, dark material melting away to reveal Princess Celestia.

The mare held a hoof to her cheek in pain before psychically shoving the stallion off of her. "Ow!" she groaned, stumbling to her hooves.

Dialga didn't seem to notice her words, as he had a medium-sized changeling wrapped in his arms. "Celly!" he laughed in a deep voice.

"Don't call me that," Princess Celestia ordered, grimacing as she rubbed her bruised bottom jaw.

The unicorn turned to her with confusion. "I... wasn't... talking to you," he retorted, gently placing Celebi back onto her hooves.

"Oh," the alicorn replied, rolling her eyes with a slight sense of embarrassment.

Before anypony could do anything more, Arceus skidded around the corner before grinding to a halt at Celestia's hooves. "Princess," she gasped, "are you alright? What happened?" she spluttered before seeing the Time-Travel Pokemon standing beside her mentor. "Celebi," she quipped with a nod.

A slight wave of fear washed over the changeling at seeing her creator's distress. Nonetheless, though, she bowed.

"I'm quite alright, thank you for asking," Celestia said, pulling the mare back to her senses. "Apart from the bruised jaw, that is." She scowled at Dialga briefly.

"I know who your captor was. His name is Necrozma, the Prism Pokemon; a reckless, and hate filled soul who bypasses Yveltal on some aspects," Arceus explained. "And we need to catch him before he targets your sister as well."

Princess Celestia's face morphed from pain into dread at the thought of the being that controlled her taking Princess Luna as well. "What?" she choked, looking up at the alicorn with no attempts at hiding her fear.\

-Lunar Wing-

Necrozma hissed angrily as he glided down the hall of deep blues and blacks. This theme, he realized was different from the place that he was last. The other halls were shades of orange and red amidst a backdrop of white clouds. The walls here were speckled with painted stars that actually seemed to glow, and the different forms of the moon.

The stallion could feel a growing pulse as he moved, that of one of the celestials. A twisted sneer crossed his muzzle, anger making way for a demonic joy as the aura grew into a pulse that he could feel seep into his body.

Necrozma nudged open a door and beheld the sight.

Laying across a regally designed bed was a very dark blue mare with a shimmering mane ad tail. She was asleep, judging by the soft snores that echoed through the room, and possessed a power that Necrozma could feel running through her veins. The crystalline stallion inhaled deeply to test her scent...

Definitely celestial.

With a lowly chuckle, the Prism Pokemon approached.