"Princess Celestia, I don't think you should be that close to the creature. It might be dangerous."

The Sun Princess didn't listen to the worried captain and instead continued to watch this unique creature that just hatched from an egg. The egg was found outside the castle by one of her royal guards. The creature resembled a diamond dog, but its fur was coloured blue with black legs and torso. Some fur on its face looked like a black mask and on each side of its head was an odd tear shaped appendages also coloured black. On its neck was what looked like a yellow collar and has rounded bumps on the backs of its forepaws, almost like it was made of metal. What an odd but cute little creature, surely it couldn't be that dangerous could it? The princess thought as it crawled out of its broken egg and trying to stand on its toes. It looked up at the much larger princess with its red eyes and caught everyone by surprise when it gave a bright smile and jumped up and hugged its arms around Celestia's neck. Her guards pointed their spears at the canine-like creature when it jumped on their princess, making her fall back on her flank in shock.

"Princess! Squad get that thing off her!"

"It's okay, Captain. I'm fine." Celestia reassured her soldiers.

"But Princess Celestia it-"

Taking a closer look, the newly discovered creature was still wrapping its arms around her in a loving hug, nuzzling into her white fur with a closed eye smile. Celestia, in turn, wrapped her hooves around it which made the canines tail start to wag back and forth.

"You must think I'm your mother. Don't you?"

The dog-like creature replied with a happy sounding bark, she looks down at it with a sad look as she thought of what to say.

"I'm sorry little one. But I'm afraid I'm not your mother." It lost its smile and tilted its head in confusion. If she wasn't its parent then where were they?

"But, I'm more than happy to play the role. Would you like to stay with me?"

Its smile came back in an instant giving off more happy barks. Celestia was also filled with joy, she aways did want to be a parent and it looked like this was gonna be the closest chance she'll get. Now it needed a name, but what should she name it? Then it got to her, its barks, while it sounds almost like any other dog, this one was different. She could almost make out some words from it. "Rio" and "lu".

"Riolu?" She asked. It jumped out of her hug and onto the floor, its eyes never looking away from her as it clapped its forepaws together.

"Riolu it is then." She announced. The other ponies didn't look so sure.

"Princess Celestia, are you sure it's wise to have it running around."

"He. Riolu here is clearly a male."

The guard captain raised and eyebrow at her and then found himself looking at the blue furred Sheath and balls that the newly named Riolu had. Everpony was startled as a head of a giant purple dragon burst through one of the castle's towers.

"I think that stack of paperwork is gonna have to wait." The Sun Princess says as she and everypony else looks at the dragon.

"Stay close to me, Riolu." Riolu without any care in the world hops next to his new mother and they both disappear in a flash.

Present time

In the main castle's throne room a scroll is teleport with a bright flash and drops to the marble floor. Riolu, not looking any different from his hatching, picks up and opens the scroll.

"Twilight sent a letter." He said, now speaking in their common language. Celestia was sitting in her throne drinking her tea while skimming through her royal paperwork. She put down her teacup on the plate and listened to Riolu as he started reading her student's letter.

"My dearest teacher, my continuing studies of pony magic have led me to discover that something really bad is about to happen! For you see, the mythical Mare in the Moon is in fact Nightmare Moon, and she's about to return to Equestria, and bring with her eternal night! Something must be done to make sure this terrible prophecy does not come true. I await your quick response. Your faithful student, Twilight Sparkle."

She smiled and watched as Riolu quickly got a new blank roll of paper with a feather and ink ready to write a response back. She knew exactly what to say.

"My dearest, most faithful student Twilight. You know that I value your diligence and that I trust you completely. But you simply must stop reading those dusty old books!" Riolu couldn't help but chuckle as he continued to write this down. Celestia continued. "My dear Twilight, there is more to a young pony's life than studying, so I'm sending you to supervise the preparations for the Summer Sun Celebration in this year's location: Ponyville. And, I have an even more essential task for you to complete: make some friends."

When Riolu was done writing it down he gave the scroll to the alicorn who used her own magic to send it to Spike the Dragon.

"She sounded pretty sure of herself. What if Nightmare Moon does come back?" Riolu asked.

"If she does I'm sure her eternal night won't last long. Twilight will make sure of it, as long as she follows my advice and makes some friends."

Riolu gave her a look. "I'm not sure if making friends is going to do much."

She in response smiled. "Maybe I should send you down along with her, you could make some more friends of your own."

"I have plenty of friends!"

"Oh?" she smirked.

"Yeah, Spike is my best friend. We hang out all the time. Then there's Twilight. Then. Then."

"Yes?"

"Oh! Her brother, Shining Armor. I've met him a few times, and also, I talk to some of the other guards while training."

She sighed as she got off her throne. "I really wish you would not try and start sparring fights with the guards."

"They don't mind in fact most of them think I have talent. I've aways felt like I was born to fight." He said giving the air some fast punches and kicks.

"I just don't like seeing you get hurt." He stopped mid kick after hearing that, he knew that he was like her own son and didn't want him to get hurt. But his fights with the guards helped show that he's strong, that his height didn't matter and could protect himself just fine.

"Come. Let's go and see Twilight and Spike off. They need to leave soon if they want to get to Ponyville on time."

Author's Note

So Yeah. That's a chapter. If people like it then I'll do more from time to time. :D
Riolu and Lucario in the anime has always bugged me. Most Pokemon say their names, but some like Riolu and Lucario just bark or growl.