Author's notes- So, I've been wanting to write a Pokemon story for a while, but I never knew what to write it on. Then recently I began to develop an obsession with Lucario, but more with Riolu since nobody really gives him any acknowledgement. So this is what my thought was: Since I loved the movie: Lucario and the Mystery of Mew, what would it be like if Lucario had a sibling that was a Riolu? Then Sir Aaron would have two Pokemon to be the Master of. Anyway, here's the first chapter, so tell me what you think!

Disclaimer: I don't own Pokemon, Lucario, or Riolu. God dammit it.

Chapter One:

A Sister?

Thick fog covered the rocky landscape, making it almost impossible to see anything. In the midst of the fog stood a tree, far too big to be normal. Lights suddenly illuminated it's massive branches. A large, powerful, birdlike creature flew from the top branch, crying out a warning. It was Ho-oh, the legendary bird pokemon.

Back on the ground, a small pokemon ran swiftly through the mist, jumping and flipping expertly over large crags of rock in her way. The pokemon's pelt was a light blue color with black markings covering her legs, arms, sensors, the front of her torso, and over her eyes like a mask. Her eyes were a blood red color. On her arms were a silver guard, one for each arm. Her ears ended in small points on top of her head. Hanging from her left sensor was a black crescent moon earring; a gift from her master.

The pokemon, who's name happened to be Riolu, stopped her fast sprint along the rocky trail and let her eyes wander over the area.

"Brother, where are you?" she muttered to herself. Lucario and Riolu, siblings and servants to their master, the Great Sir Aaron, were currently patrolling the mountainous area not far from the outskirts of Cameron Palace. The older brother of the two siblings had sensed a great threat a few days ago: Two armies of Pokemon about to clash in a massive war that would leave no survivors. Sir Aaron had then decided to split up the area into three parts so that he, Lucario, and Riolu could patrol the areas to watch for the two armies. Riolu was finished with her patrol and had made it to the meeting spot where she and Lucario both met after patrols to go back to the castle together. The older Pokemon was always the first one there. This time it had been different.

Wanting to make sure that her brother wasn't in any trouble, Riolu placed a paw on her chest and closed her eyes. "Aura is with me," she whispered the familiar phrase. The two sensors on the sides of her head immediately rose up and the moon earring began to glow in a blue light as her aura began scanning the area. She and Lucario had a connection that could allow them to find each other and speak to each other if they were separated. Riolu's aura had been very weak when she was young and the connection couldn't be formed, no matter how hard the siblings tried. Sir Aaron had then gifted her with the earring. It allowed her to communicate with him and Lucario and use her powers for attacks while the real aura inside of her grew stronger. Even though her power was as powerful as her brother's, Riolu still wore it as a symbol of her loyalty.

She finally found her brother. He was running down a trail not that far away from her position. "Brother, do you hear me?" she asked him.

Lucario stopped running. "Riolu?" came his deeper voice.

"I'm at the meeting point. Why aren't you here yet? Did something go wrong?

"I'm afraid so." came to reply. "It seems that the armies have gathered sooner than I thought. They're both marching toward Cameron Palace."

That was what the sister had been dreading. "Is there anything I can do?"

"Get in contact with Sir Aaron the way I taught you. Tell him what's happening. Then use your aura detection to find me." came Lucario's command.

"Okay. I'll tell him now."

"Just promise me that you'll be careful, Riolu." he told her, concern replacing his serious tone.

A small smile spread over the pokemon's face. "I will, Brother. Just as long you promise me the same thing."

After Lucario promised, Riolu ended the connection. She then ran as fast as her legs would carry her down the path. She soon came upon a cluster of large, pale blue crystals. Kneeling down on one knee, the pokemon placed her paw upon the crystals. They began to glow as they sensed her aura.

"Hear me, Sir Aaron!"

It wasn't long until the transmission reached him. "What is it Riolu?" came the voice of her master.

"Lucario has just told me that the two armies are about to clash, Master. The kingdom is caught between them. Once the fighting starts, everybody will be destroyed." Riolu explained.

Sir Aaron didn't answer for a few moments, which worried his young comrade. "Master?"

Suddenly, a new image filled Riolu's vision. She gasped in fright and stumbled away from the crystals, ending the contact with Sir Aaron. She was looking at her brother standing on a flat, rocky cliff. He was surrounded by three Houndoom, all wearing red armor. Obviously they were from one of the armies.

Riolu's eyes flew open. She started running, using her aura to find Lucario's location. "Don't worry Brother, I'm coming." she thought. She could sense his panic as the Houndoom began to attack him. She stopped suddenly. The image came back to her. Lucario was running in the opposite direction from the location where he was previously. What bothered her was that he seemed to be using his aura to guide himself instead of his eyesight. Riolu followed him in the direction he was heading, a unsettling feeling starting to form in the pit of her stomache.

The pokemon soon ended her sprint when she and Lucario came to a valley. She sensed that Sir Aaron was here. Though she was grateful, she sensed anger and shame coming off of her master's aura. As Lucario ran to the man clad in black and blue and holding his crystal aura staff, Riolu his herself behind a large boulder. That's when Lucario spoke.

"I knew that you would come, Master."

"Lucario, what happened to your eyes? Where's Riolu?" the raven asked.

It was then that the younger sibling saw that her brother's eyes were closed and a red line of irritation formed across the shut lids. "The damn Houdoom probably did that." Riolu thought, bristling in anger.

"She's on her way. Don't worry about my eyes sight, Master." Lucario had replied.

Sir Aaron turned his back, shielding his eyes with the pokeball imprinted hat on his head. "Don't call me that." he muttered.

"What?"

"From this point foward, I'm no longer your or your sister's master. I've abandoned my queen and the kingdom. I'm never returning."

"What are you talking about?" Riolu whispered.

It was then that Sir Aaron started to run.

"Master, wait!" Lucario cried, running after him.

Riolu ran out from behind the rock. "Sir Aaron! Lucario!"

Lucario stopped and turned. "Riolu?"

The swooshing sound of something being thrown made Riolu stop and look up. Sir Aaron had thrown his staff, which had landed in front of Lucario. It started to glow, illuminating the area.

Too late Riolu realized what was happening. She ran as hard as she could toward her brother, and yelled out to him as Lucario cried out to their master.

"SIR AARON!"

" BROTHER!"

She reached out to grab his paw, but his body dissolved into blue sparkles, which then got absorbed into the crystal on the staff. The two steel sensors which resembled Riolu's own raised up and clanged against the staff.

After the light died down, the younger sibling slowly approached the staff. The paw that had failed to reach Lucario in time was placed on the crystal.

"Lucario?" she whispered, her voice cracking as silent tears flooded down her cheeks. She could defiantly feel his aura still, but it felt cold and empty. She placed her forehead against the staff and let the tears come. Both her master and brother were gone. The only family she ever had. She hadn't been able to do anything.

A sudden pokemon's cry made her open her eyes. She looked behind her and saw a large Pidgeoto standing behind her. Another one of Sir Aaron's servants and a dear friend of hers.

"Are you alright, Riolu?" he asked her.

Wiping away her tears, she picked the staff out of the ground and brought it over to him. "I need a favor. Please bring this to the Queen if she's still at the palace." she told him, forcing her voice not to shake.

Pidgeoto nodded and took the staff in his beak.

"Now, get out of here before the two armies clash. It will be dangerous." she ordered him. With another nodd, he took off into the sky and flew in the direction of the palace.

Riolu climbed out of the valley and started running in the direction away from Cameron Palace, tears starting to flow again.

"Brother... please forgive me."

Post notes- So what did you think? I'm watching the movie while I write this story because I haven't seen it in awhile. Make sure you review. In exchange you'll get another chapter from me. BUT NOT UNTIL I GET MY REVIEWS! That will be the deal lol.