Kumquat Island

Sometime after winning the Trovita Badge, Ash and the gang met a renowned firefighter named Captain Aiden. Captain Aiden owned a bunch of Squirtle, Wartortle and Blastoise for his team. The gang even helped him put out a fire with their water type Pokemon. Now they arrived on Kumquat Island, where Ash could obtain his final Orange League badge.
"Aside from having a gym." Tracey said. "Kumquat Island is famous for it's luxurious hotels, beaches and hot springs."
"Oh I want to try them out." Misty said.
"Me too." Tracey replied. "What do you say Ash?"
"I'm here for a gym badge, not a vacation." Ash stated.
Just then, Ash was pulled into a hug by a middle-aged woman. 
"Oh Travis, I've missed you so much." The woman said, hugging Ash rather tightly.
"Uh, ma'am." He said, unable to breathe. "My name's not Travis."
The woman looked at Ash, and then quickly let him go.
"Oh, I am so sorry." The woman apologized. "The truth is you look so much like my son Travis, who's a Pokemon trainer as well."
Ash accepted her apology.
"Is your son on a Pokemon journey?" Misty asked.
"Yes." The woman answered. "Oh and I am Luana. I'm the manager of my own luxury hotel and the leader of Kumquat Gym." 
Ash was delighted when he heard that.
"My name is Ash." Ash introduced himself. "And I wish to battle you for my final Orange League badge." 
"I accept your battle Ash." Luana said. "We will have it tomorrow, and I propose a double battle."
Ash knew what a double battle was; trainers had to battle with two Pokemon each.
"So I suggest you four spend a night in my hotel." Misty, Tomo and Tracey agreed to the offer right away and Ash had to agree too; he couldn't beat that. Just then Ash noticed a Pokemon was standing next to Luana; it was an Alakazam.
Ash looked at Alakazam on the Pokedex.
"Alakazam, the Psi Pokemon and the evolved form of Kadabra. It's brain can outperform a super computer. It's intelligence quotient is said to be 5,000."
"I take it this Alakazam is yours." Ash noted.
"That's right." Luana nodded. "It's my battling partner."
This meant Ash would face Alakazam in the gym battle tomorrow. 
Luana led the gang to her luxury hotel. Apparently it was not only her hotel, it was also where gym battles took place. And it had rooms where both Pokemon and their trainers could relax. Luana offered the gang the night in her hotel's most exquisite suite free of charge. And right now the gang enjoyed the hot spring.
"So Ash?" Tracey asked. "What two Pokemon are you going to use?" 
"Pikachu to start, but I don't know what my second one will be." Ash said.
"Well we already know Luana's first Pokemon is Alakazam." Misty noted. "It's just the second Pokemon we don't know about."
Ash started to think for a minute, and then he got the answer.
"I know." He said. "I'll use Gengar as my second Pokemon."
"That's a great idea." Tracey said. "Besides ghost type Pokemon are strong against psychic type Pokemon."
Misty and Tomo agreed with the idea too. So it was decided Ash would use Pikachu and Gengar for his gym battle with Luana.
The next day it was finally time for Ash's gym battle with Luana. 
"Well Ash, are you ready?" Luana asked.
"You bet." Ash answered. "I'm ready as I'll ever be."
Tomo, Misty and Tracey watched from the sidelines. 
"Just think." Tracey said. "If Ash wins this, he can finally enter the Orange League."
"Yes but we still don't know what Luana's second Pokemon is." Misty said.
Soon it was time for the gym battle to begin. 
"Alright Ash here are my two Pokemon." Luana said, throwing two Poke Balls. 
Luana's two Pokemon turned out to be Alakazam and a Marowak. Ash sent out Pikachu and Gengar. Now the battle had started and Ash was allowed to attack first.
"Okay Gengar use Icy Wind on Marowak and Pikachu use Thunderbolt on Alakazam." Ash said.
Pikachu sent a blast of electricity at Alakazam and Gengar blew sparkly blue snow from it's mouth at Marowak. This didn't concern Luana though. 
"Marowak use Bone Rush to fight that electricity and Alakazam use Psybeam against Icy Wind." Marowak's Bone Rush attack blocked the thunderbolt; Bone Rush was a ground type move so electric type moves were useless against it. Alakazam's Psybeam broke the Icy Wind into little bits of snow.
'Whoa.' Ash thought. 'The way her Pokemon did that means they're a real fighting team. We will need to attack another way.'
"Okay Gengar make yourself invisible." Ash said. Gengar disappeared through the floor.
"I wonder why Ash told Gengar to do that." Misty said.
"I might have a idea." Tracey stated. "Since ghost type Pokemon are known for sneaking up on both humans and Pokemon, Ash is deciding to use that ability to sneak up on Alakazam and Marowak. A clever idea if you ask me." 
"Pikachu, Iron Tail on Marowak." Ash ordered.
Pikachu charged at Marowak with his tail metallic silver, ready to attack. At that moment Alakazam appeared in front of Marowak as if to protect it.
"Now Gengar, Shadow Punch." Ash said.
Gengar materialized through the floor with his right arm turning black and purple, punching Alakazam. Alakazam took damage from the Shadow Punch.
"Wow." Tracey gasped. "Ash's plan worked."
"Ash gets more amazing when it comes to battles." Misty admitted.
"Way to go, big brother." Tomo said.
Luana was impressed with Ash's skills too. Ash instructed Pikachu and Gengar to use Thunderbolt and Icy Wind again.
"Marowak use Bone Rush again and you use Psybeam again Alakazam." Luana said. 
Marowak was heading towards Pikachu's Thunderbolt attack again, but Gengar appeared in front of Pikachu and released his Icy Wind attack at Marowak hurting it a lot. Ice type attacks were strong against ground type Pokemon. Luana was surprised by that.
"I had a feeling you would pull that move again." Ash said. "So I decided to use Pikachu's Thunderbolt as bait for Marowak, then while Marowak was distracted by Pikachu I would have Gengar attack it too." 
Just then Pikachu's attack changed from Thunderbolt to Iron Tail and it struck Marowak, causing it to faint from that blow.
"Now Gengar Shadow Ball and Pikachu Thunder." Ash said.
Pikachu fired a massive bolt of electricity from his body at Alakazam and Gengar sent a big purple and black ball from his hands at Alakazam. Thunder and Shadow Ball caused Alakazam to faint, earning Ash the victory.
Ash hugged Pikachu and Gengar to thank them. Gengar licked Ash on the face with his long tongue. Luana returned Alakazam and Marowak then walked up to Ash. 
"I must say Ash." She said. "That was the best battle I ever had and you did a very good job. So as proof of your victory, I present you with the Jade-Star Badge." 
The Jade-Star Badge was a grey conch shell with a small yellow gemstone.
"I finally got all four Orange League badges." Ash said happily.
"Then that means you can enter the Orange League on Pummelo Island Ash." Luana said. "And you must defeat the leader of the Orange League to win. But I warn you now he won't be very easy to beat." 
"That's okay with me because I like a tough challenge." Ash said.
So with the Jade-Star Badge in his possession, the gang said goodbye to Luana and left Kumquat Island for Pummelo Island so Ash could finally enter the Orange League.