A/N: Hey, it didn't take me forever and a half to put up the next chapter just like my other Pokémon crossover. Also, I have a fun surprise for all of you in the next chapter.

Disclaimer: I do not own RWBY and/or Pokémon. They belong to their original creators

The Blazing Sun & The Serene Moon

Route Four: Island Challenge Accepted

Yang could hear her heartbeat increase slightly with each second passing. This would be her first rival battle against Blake and everyone in Iki Town and her father would be watching. The young blonde was trembling with both nervousness and excitement. "Ready…" Yang brought up her Pokéball enlarged already and so did Blake. "Begin!"

Yang was the first to toss her Pokéball in the air and finally had the chance to call out the catchphrase she wanted to shout for so long. "Let's burn, Mimi!" The Pokéball opened and Buneary came out with a battle-ready cry.

Blake threw her Pokéball next into the air. "Cast, Pichu!" Her Pokéball opened and a flash of light came out in the form of a Pichu happily jumping around. Blake extended her arm forward with her palm open. "Pichu, Thundershock!"

Pichu smirked snidely as small sparks emitted from its body. "Pi…chu!" Pichu let out a loud cry as it sent a small jolt of electricity at Mimi.

"Mimi, jump now!" Mimi did as her trainer commanded and jumped just in time to avoid the attack. "Use Pound from above!" Yang's Buneary flipped its body forward ears first and started to drop while aiming at Pichu.

"Jump back now!" Pichu did just that and avoided the attack while Buneary's attack struck the platform instead.

Yang wasn't going to give up that easily and pressed on. "Don't let Pichu get away. Go after it and use Pound again!" Mimi used her ears to flip back feet first on the platform and chased after Pichu.

Blake smiled as Yang unknowingly played into her hands. "Gotcha." Yang gasped as soon as she heard the other girl say those words. "Pichu, close the distance and use Thundershock!" Pichu smirked as it rushed over to Buneary which seemed equally surprised as her trainer. Once Pichu was close enough, small sparks emitted from its body and yelled while delivering its attack at Buneary.

Mimi felt the attack hit and sent it away from the other Pokémon. Yang was immediately worried about her Pokémon. "Mimi! Are you okay?!" Mimi groaned a little while glancing back at her trainer to give her nod. Seeing that made the young blonde feel a little easier but she had to be more cautious now. "That was a good play Blake just did. She's definitely tougher than the route trainers I battled earlier. What can I do?" An idea finally had struck her and gasped at the realization. "That's it!" Mimi looked back at Pichu who pulled its lower right eyelid down while its other eye was closed and sticking its tongue out at her. Mimi growled as Pichu was clearly mocking her. Yang extended her hand forward. "Mimi, dash forward to Pichu now!" Mimi kinda questioned her trainer's order but had full confidence in her. Mimi did as it was told and came straight at Pichu again.

Blake wasn't entirely too impressed by this decision. "You don't learn, do you? Pichu, close the distance again and use Thundershock!" Pichu stopped its taunting and moved forward toward Buneary again.

This time, Yang smiled as it was Blake who played into her hands. "Mimi, take a hard-right turn now!" Before Pichu could do its attack, Mimi changed her direction and moved right on her trainer's command. Both Pichu and Blake were surprised by this change of tactics. "Pound, now!" Once Mimi's left foot touched the platform, it jumped right back at Pichu and unrolled its right ear once she was near her opponent. Her attack struck the side of Pichu's face and sent it flying away from her.

"Pichu!" Blake saw her Pokémon crash on the platform. Pichu slowly stood up after taking Mimi's attack in the face. This time it saw Mimi doing the same taunt at it as Pichu did to Mimi previously. Pichu scowled at the other Pokémon. "Pichu, use Thundershock now!" Pichu was all too glad to follower its trainer's order and sent another jolt of electricity at the other Pokémon. However, Mimi easily dodged the attack by jumping out of the way and continued to hop around Pichu to further confuse it. Pichu looked back and forth and everywhere where Buneary hopped to and started to launch its attack at its opponent but Mimi was able to dodge it every single time.

With each attack, Pichu was starting to become fatigued from overusing its electricity since Pichu, in general, was not very good in handling its electoral output all that well. This was something Ghira noticed easily. "Blakes's quickly losing control of this battle."

After delivering its last Thundershock, Pichu panted heavily and tried to gather the electricity for its next attack but couldn't anymore due to exhaustion. Yang saw this as her prime chance now. "Mimi!" Mimi knew what her trainer wanted her to do and rushed toward the tired Pichu. Mimi unfurled one of its ears and struck other Pokémon in the stomach. Mimi then curled up one of its ears and retracted away from Pichu only to turn around while uncurling its other ear and smacked Pichu away again. Pichu flew away from Buneary and landed back on the platform with swirls in its eyes.

Ghira extended his arm toward Yang. "Pichu is unable to battle. Buneary is the winner!"

Yang cheered as did Mimi at their first victory. "Alright, Mimi!" Mimi celebrated with her trainer but that celebration was cut short when sparks emitted out of her and cringed just a little. Yang stopped cheering and became immediately worried. "Are you okay, Mimi?" She then realized what happened to her Pokémon. "Darn it. I knew it was only a matter of time before Pichu's Static ability kicked in."

This time Blake smiled at what was happening. She may have lost first round but the battle was far from over. Especially now that her Pichu left one gift for its opponent. Blake brought up her Pokéball and aimed it at her Pokémon. "Return, Pichu." A red stream of light hit Pichu and it went inside of its Pokéball. She put Pichu's Pokéball away and grabbed another one. Blake stared intently at her opponent. "I refuse to lose to someone who's content in staying in their parent's shadow." She tossed the Pokéball in the air."Cast, Rowlet!" The ball opened and Rowlet appeared on the stage now.

Yang was present in a slightly difficult position now. "What's my next move? Mimi's paralyzed probably tired by now and Siren's weak against her Rowlet."

"Bun!"

Yang looked at Mimi who seemed she wanted to continue. "You sure you want to keep going?" She saw her Pokémon nod and smiled. She extended her arm forward. "Okay, Mimi, let's keep going!" Mimi responded by crying out her name strongly.

Blake thought to start off the second round and since Buneary was paralyzed, its speed was lowered considerably. "Rowlet, use Leafage!" Rowlet hooted as it flapped its wings into the air and its wings started to glow bright green. Rowlet flapped its wings at Buneary and multiple green leaves fired from its wings right at the other Pokémon.

"Mimi, jump!" Mimi crouched slightly before jumping high into the air to avoid the attack.

Unfortunately, this move left Mimi wide open for Rowlet's next attack. "Tackle it while it's in the air!" Rowlet quickly flew over to where Mimi was.

Yang had to think of a counter and fast. "Use Pound to stop Rowlet's attack!"

Mimi was ready to carry out her trainer's command but then sparks appeared all over its body again and couldn't move. Rowlet came in close and struck Mimi with its full body. It quickly passed Buneary by and flew to where it was now above. "Strike it down with another Leafage!" Rowlet hooted once again and flapped its wings once again to deliver another flurry of bright green leaves upon Buneary.

The leaves struck Mimi all over and sent it crashing to the stage. Rowlet flew back to its trainer's side and everyone was anticipating of what would happen next. Yang and the crowd saw Mimi slowly stand up after crashing but halfway through, Mimi dropped to the floor again and had swirls in its eyes. Ghira extended his arm toward Blake this time. "Buneary is unable to battle. Rowlet is the winner!"

Yang couldn't help but feel disappointed that she let down her Pokémon and pointed Mimi's Pokéball at her. "Thank you for everything, Mimi." She returned Mimi back to her Pokéball and put it away. The young blonde then pulled out Siren's Pokéball and stared at it while thinking what to do next. "If I send out Siren, I'll be at a type disadvantage. I'll lose for sure."

Doubt was easily building up inside of Yang and was certain she couldn't do this. "How do I win against the type I'm bad against?" Yang gasped as she now remembering one of the talks she had with her mother several years earlier. Images showed of Yang being in bed while her mother sitting on a chair next to the bed with a closed book on her lap. "What brought this up, Yang?"

A younger Yang gripped her covers looking worried. "It's just…you're always so busy battling other trainers and I know you have to face types you're weak against. How do you win when you're facing something like that?"

Raven pondered the good question her daughter brought up and smiled. "Well, to tell the truth, I have lost to trainers who did have a type advantage over me but I also won against them."

Now Yang was curious as to what her mother meant by that. "How did you do that?"

Raven kept smiling at her daughter. "It's true type advantage can give an upper hand in a battle but there's more to it than that. Like I said, I battled against types I'm weak against and was still able to win. That's because type advantage only plays one part in a battle. The other parts all depend on you. Honestly, if every battle was decided solely on type advantage, then any novice trainer would be a Gym Leader or an Elite Four member. Basically, Yang, the answer to your question is this…"

The flashback slowly faded into white and Yang was brought back into the present. Yang smiled as she almost forgot about that talk with her mother. "It's like you said before, mom. Always trust in your Pokémon as they'll trust in you." She tightened her hold on Siren's Pokéball and threw it into the air. "Let's burn, Siren!" The Pokéball opened and Siren appeared in her usual entrance. "Let's win this!" Siren barked eagerly in agreement with her trainer.

Blake couldn't help but raise an eyebrow at what her opponent had declared. "Win this battle? Doesn't she realize she's at a disadvantage here?" She ignored that fact and focused on winning the battle. "Use Leafage, Rowlet!" Rowlet hooted as it took to air again with its wings glowing and flapped forward to send several glowing leaves at Siren.

Yang already thought up of a way to deal with the attack. "Siren, use Water Gun to displace the leaves!" Siren barked before unleashing her Water Gun attack at Rowlet's attack. The water attack struck Rowlet's attack and scattered the leaves apart.

Blake narrowed her eyes as she thought of her next move. "Use Tackle on Popplio!" Rowlet hooted at its trainer's command and flew over to where Siren was.

The young blonde smirked as she knew how to counter the incoming attack. "Brace for impact, Siren!" Yang's starter barked as it stood up on her flippers and awaited the incoming attack. Rowlet slammed its body into Siren and pushed the other starter. This was exactly what Yang wanted. "Grab Rowlet tight with your flippers and don't let go!" As her trainer commanded, Siren grabbed ahold of Rowlet with her flippers as tightly as she could which surprised the Grass starter and Blake. "Jump and slam Rowlet back to the ground!" Siren barked and twirled her body around before leaping up into the air and tossed it at the ground. Rowlet crashed to the stage with a slight bounce from the impact. "Now use Pound from above!" As Siren descended right on top of Rowlet, she raised both of her flippers above her head and struck Rowlet as soon as she was close to the other starter.

Rowlet bounced away from Siren and reposition itself to land on the floor while appearing to be a little miffed. Blake had a similar feeling as she refused to lose even though she had a type advantage. "Rowlet, scatter your Leafage around Popplio!" Rowlet hooted as it jumped and its wings glowed once again to send several green leaves at the other starter. Instead of them going in a straight path, the leaves were spread into two different paths curving outside.

Yang gritted her teeth as she couldn't deal with one attack without being hit by the other. Jumping out of the way wouldn't do any good as it would leave her as an open target for another attack from Rowlet. There was only one choice she could make. "Siren, roll forward!" Siren barked as it curled into a ball and rolled forward as both attacks missed.

Blake wasn't going to let up on her attacks. "Head toward Popplio now!" Rowlet flew over to where the other starter was. As Siren uncurled herself, Rowlet was already in front of it. "Now, use Leafage!" Rowlet threw its wings forward and the glowing green leaves struck Siren head-on and sent it away from the other starter.

"Siren!" Yang knew a direct attack like that would inflict serious damage on her starter and saw how injured her starter was. Siren stood up on her flippers but it couldn't take another Leafage attack or else she and Yang would lose the battle.

Blake smirked as she had this battle in the bag now. "Rowlet, finish this with Leafage!" Rowlet flapped its wings and sent its final attack at the other starter. All Yang could do is stare in fear as the attack neared her starter. She tried to give a command to Siren but the words couldn't come out of her mouth. In her eyes, everything seemed to slow down. Siren was in the same state of mind as her trainer and narrowed her eyes. On her own, Siren took in a deep breath and let out a resounding bark. What was strange about this bark, however, was that it echoed throughout the stage and a beam bright pink hearts came out of Siren's mouth. This unknown attack countered the incoming Leafage attack and struck Rowlet altogether. Rowlet let out several surprised hoots as this strange new attack as it was overcome by it. As the attack subsided, Rowlet appeared to very damaged and hooted weakly before dropping to the ground. Blake was wide-eyed at what she just saw and couldn't make out what happened to her starter.

Yang was in the same state of shock as her rival as she'd never seen Siren use that kind of attack before. She brought her Pokédex out to see what kind of move her starter used. The young blonde looked at the summery displaying Siren's move pool and saw a new move. "Disarming Voice?" According to what Yang was reading, this new move was apparently a Fairy-type move. She had no idea her starter would learn such a move as this but she was sure glad that it happened.

Ghira observed Rowlet a few seconds longer before raising his arm toward Yang. "Rowlet is unable to battle. The winner of this match is Yang Xiao Long!"

As soon as he said those words, the crowd cheered and so did Yang as she ran up to her starter and picked her up. "We did it, Siren! We won and you learned a new move to boot!" She snuggled with Siren while the water starter barked happily. While the crowd was cheering for Yang's win, there were several who weren't. Both Ghira and Kali stared at their daughter who returned Rowlet back into its Pokéball with her bangs hiding her eyes. Ghira could tell his daughter was not happy with the outcome of the match. All Blake could do now was stare at Rowlet's Pokéball and gripped it tightly. "Hey!" Blake looked up at Yang who was walking up to her while holding her starter in her arms. The other trainer smiled brightly at her. "That was a great battle. You really had me going there the entire time." Yang extended one of her hands toward the other girl while still holding onto Siren with her other arm.

Blake just stared at the hand gesturing for her to shake it. She had half of a mind to brush it off but that would be poor sportsmanship. Blake accepted the handshake and gripped Yang's hand. A little too hard for Yang's liking as she winced a little from the grip. There was applause again from the crowd seeing the two young trainers shaking each other's hands and letting go once it was finished. Yang resumed holding Siren in both of her arms again. "Hoo-ee! Another great battle this year."

"I bet Tapu Koko liked it, too."

Ghira smiled as he had to agree with previous comments. "It was a fine battle indeed. I think even Tapu Koko enjoyed it."

"Ko-ko-Kooo!"

Everyone looked around as they heard their guardian's cry. Ghira looked up at the sky. "Well, you heard it yourself. It seems Tapu Koko approves you both." He then turned to Yang." Oh, I nearly forgot." The Kahuna approached the young blonde. "I believe this belongs to you now, Yang."

Ghira dug into his pocket and brought out a strange looking object. To Yang, it seemed to be a bracelet of some sort. "This is so cool looking! What is it, exactly?" She put her starter down and took the bracelet from the Kahuna. Yang slipped the strange bracelet on her left wrist and immediately felt a strange connection to it.

It was time for Ghira to explain what was it that he gave to Yang. "It is known as a Z-Power Ring. It is a mysterious armband that can draw out the power that dwells deep inside your Pokémon. It'll allow to summon forth their Z-Power. That Z-Power Ring you wear now was made of that sparkling stone Tapu Koko has given you and we Kahunas can use these Z-Power Rings from them. However, in order to truly utilize it, you will need to go through the Island Challenge and collect the necessary Z-Crystals for yourself if you want to bring forth your Pokémon's Z-Power. It seems Tapu Koko has taken a shine to you if it has already given you a sparkling stone. Perhaps it has a mission for you." Yang took a closer look at her new Z-Power Ring and wondered what exactly does Tapu Koko has planned for her.

However, that question will have to be answered later as Kukui spoke up. "Well, it's time for you to get out there and start your Island Challenge! If you visit every island, maybe you'll figure out what that mission is."

Yang turned to the Professor with a confused expression. "Wait, what's this Island Challenge you're talking about?"

Kukui brought up his hand showing four of his fingers. "Four islands! You'll travel to each of the four islands here in the Alola Region. The Island Challenge is about aiming to be the strongest trainer. The Island Challenge Champion. Woo! But I'll let Ghira explain the rest."

Ghira nodded and continued to explain what Kukui started. "The Island Challenge Kukui spoke of…it is a journey to overcome your own limitations, as you travel the far corners of Alola and meet with others along the path. It is the great adventure that children in the Alola Region embark upon, along with their Pokémon, once they reach eleven years of age. Allow me to give you both the Island Challenge Amulets the two of you will need."

The Kahuna first gave Blake an amulet. "Thank you, father."

He then turned to Yang once again. "There is one for you as well, Yang. Please do give the Island Challenge a try." Ghira gave the young blonde her own amulet.

"Thank you very much, sir." Yang opened the strap of her bag and placed her amulet in front of it.

Kukui nodded as they took their first step into the Island Challenge. "Yeah, Doing the Island Challenge is the best way to really get to know Alola!"

With the battle over now, so was the festival and the people began to clear out and return to their homes. Yang, Lillie, and Kukui saw the Kahuna, Kali, and Blake standing in front of their home. Yang waved at her rival while still smiling. "Hey, Blake! Let's battle again sometime!" Blake's response was just staring blankly at the other girl before being the first one to enter her home. Ghira and Kali waved goodbye to the other group before following their daughter into the house.

Once inside, they saw their daughter already heading to her room. "Blake." She stopped when Blake heard her father call out to her. "Before you go, I just want to say you performed your best. Don't let your loss deter you."

Blake didn't look back at her father but did give him a reply. "I won't." Those were the only words she said to Ghira before heading to her room and closing the door. Blake leaned back at her door and scoffed at what happened in her battle. "Unfortunately, my best isn't good enough. I must do better. Otherwise, I'll always remain a shadow. The next time we battle, she won't be as lucky."

Yang suddenly stopped walking and looked back to where the stage was. Lillie stopped as well and was curious why the other girl stopped. "Is something the matter, Yang?"

The other young blonde stared for a few seconds longer before closing her eyes and shook her head. "It's nothing. Must've been the wind or something." She opened her eyes and smiled at Lillie. "Don't worry about it too much."

Lillie nodded at the other girl as she'll take her word for it. While they're standing around together, she did have a few things to say. "Tapu Koko is amazing, isn't it? I hope I can meet it again someday and thank it for saving Nebby."

Nebby cried out in the bag while moving around. Lillie had to grab her bag in order for Nebby to settle down. Yang couldn't help but laugh. "Yeah, me too."

Lillie was glad to hear that and understand why Yang would agree. "It saved you as well, didn't it? And left you with that Sparkling Stone, even though you're a stranger to this place."

"Hey, you two!" Both girls turned forward to see Kukui waving at them. "Suppose it's time we get you kids home, yeah?"

Home sounded very nice now after having a battle against Blake. "Coming, Professor!" Yang turned to Lillie and smiled at her. "Come on, Lillie!" She ran over to where Kukui was and was waiting for her now.

Lillie couldn't help but smile gently at the thought of the people she was with now. "Nebby…Alola is full of all kinds of wonders, isn't it?" With those words said, Lillie walked up to Kukui and Yang and they all walked together back home and awaited for what tomorrow would bring.

"That was a most mysterious event." Walking down from the stairs were the two mysterious individuals Yang ran into earlier. "A festival to celebrate drawing forth one's full power."

The younger of the two giggled at her partner's observation. "You looked like you were enjoying the show. Did you want to take part in the battles too?"

Her partner scoffed at the words. "Don't be silly. We are here to investigate and learn." He turned to his partner. "Even with all of our technology, we cannot control the Blinding One's light. Thus, we are left with no choice but try to stop it by force. And yet it seems the humans of this Alola can wield powerful auras."

That was something the younger of the two could agree upon on and looked back at her older partner. "Yeah, what'd they call that thing? A Z-Power Ring? It's aura readings were off the charts. Do you think that's why can control auras like that? Alola is definitely an amazing place. Let's go check the next site." Her partner nodded and proceeded to head to their next objective. "By the way, that blonde girl seems to have an unusually strong aura. What do you think that means?"

Her partner was also curious about but couldn't make a conclusion based on what they saw. "I'm not sure but…there is something rather unique about her. Perhaps…" They would need more data to come to any conclusion but as of right now, Yang Xiao Long was a person of interest to them.