Another story! I've had this first chapter basically finished for about a month now, so I decided to finish it and post it. Enjoy!

Disclaimer: I don't own Sailor Moon, Pokemon or Cadbury. I wish I did, though.

"Serena? Since when do you spend your school holidays in the Library?" Amy asked, poking her head around a bookshelf after spotting her friend's trademark hairstyle through the shelves. Serena looked very grumpy as she looked along the half-empty shelves of encyclopaedias.

"Since my mum threatened to ban me from sweets unless I get a good grade on my History project. I would have used the internet, but Sammy wrecked the computer somehow, and no-one has any idea how to fix it," Serena said, pulling down an encyclopaedia marked 'P'. Serena carried the book over to Amy's table, which was already covered in the missing half of the encyclopaedias.

"Oh, I see. What topic did you get?" Amy asked.

"Ms H gave me Pompeii. It's not that reading about mouldering old ruins isn't interesting, but I'd rather be playing video games," Serena said, opening her encyclopaedia and flipping through the pages. "Let's see... Plato, Plumbing, Poetry, Pokemon, Poland... Hang on, what was that?" Serena said, flipping back a few pages. "Pokemon? Never heard of them. Let's see, what does it say... 'Pokemon are mythical creatures that supposedly have control over the elements of the planet. Some believe that Pokemon helped in the creation of the planet. It is assumed that Pokemon went extinct, as confirmed sightings have not appeared for over a thousand years. However, there are some who believe that the Pokemon simply went into hiding or underground, as there have been numerous unconfirmed sightings over the past 300 years. It is supposed that animals are descendents of these creatures, as the rough drawings of Pokemon often bear similar structure and appearance to animals such as birds, squirrels, mice and fish. Indeed, many creatures still seem to hold some of the abilities of their supposed predecessors, such as sensitivity to weather changes. Many people, from enthusiasts to scientists, have gone in search of these creatures, and most have returned empty-handed. There was one person, however, who claimed to have found a small cavern in the side of Mt Fuji. The discoverer, Professor Samuel Oak, claimed that the cavern contained not only hundreds of images of Pokemon, but also a large altar covered in an ancient language. However, as Oak's discovery could not be verified, he attempted to return to the cavern. No trace of Oak or his exploration team has been sighted since.' Wow, I wonder what happened to them," Serena said, examining an illustration of a ball that looked about the size of an orange. The ball was red on the top and white on the bottom, and the caption read, 'Artist's illustration of a Pokeball. The pokeball was supposedly used to capture Pokemon'.

"Shouldn't you be researching Pompeii?" Amy asked.

"Oh, who cares about some city that got destroyed by a volcano. This is actually interesting!" Serena said, going back to the shelf of encyclopaedias and pulling down an atlas and an encyclopaedia marked 'O'. She dumped both books onto the table and opened the encyclopaedia. Flipping through, she found a small section on Professor Oak, but no clue as to what happened to him or his team, or how to find the cavern. Serena frowned and turned to the index at the back of the encyclopaedia, hoping to find a page on Oak's team. She ran her finger down the list, unable to find anything. She sighed and absently stroked the back page, wondering what to do next. As she stroked, her sensitive fingers picked up on a raised area on the inside of the back cover. Serena flipped the page over to find an image lightly embossed on the inside cover. Serena felt a tingle of excitement run down her spine as she realised that the symbol was a Pokeball.

"Amy, come and have a look at this. Look, it's a Pokeball, just like the one in that picture in the other book," Serena said, pointing at the picture.

"Wow, what a coincidence," Amy said vaguely, not looking up from her book. Serena continued to examine the back cover, and noticed that one of the edges seemed to have been pried loose and then stuck back down.

"Hey, is it just me, or does it look like something's been hidden in here?" Serena asked. Amy looked up at this, and Serena showed her the cover.

"Hey, yeah, it does look like it's been tampered with. Pass it here," Amy said. Serena handed over the book, and Amy placed it on her lap under the table. She glanced around for a moment, before pulling out a small pocket knife and carefully lifting the edge. She reached in carefully and pulled out a yellowing piece of paper, which she passed to Serena.

"Amy, you didn't!" Serena gasped. Amy pressed her finger to her lips and took a small tube of superglue from her pencilcase, then carefully glued the cover back together again.

"The way I see it, that page probably wasn't stuck down very carefully, so I was simply fixing it," Amy said, closing the book and passing it back to Serena. Serena slipped the yellowing paper into her bag and helped Amy sort out which books they were going to borrow(Serena borrowed both of the encyclopaedias, while Amy borrowed what looked to Serena to be three dozen different books), then the two hurried out of the library. Serena pulled back her sleeve and turned on her communicator, calling her four friends.

"Guys, we've got a mystery on our hands. Amy and I are heading over to the Temple. Meet us there, OK?" she said.

"OK, Serena."

"Gotcha."

"Ooh, a mystery! Sounds exciting! I'm on my way." Serena and Amy laughed at Mina's answer, then set off towards the Cherry Hill Temple.

"Hi, guys! Thanks for coming, this sounds really exciting!" Serena said, running over to where Raye, Mina and Lita were waiting for them.

"Hey, you're here! Finally! So what's the mystery about?" Mina asked jumping to her feet. Serena carefully took the paper from her bag and passed it to Raye.

"Amy and I found this hidden in an encyclopaedia at the Library," Serena explained.

"You were at the Library? Intentionally?" Raye asked incredulously. Serena stuck her tongue out at Raye. Raye copied her friend and unfolded the paper to reveal a map of Mt Fuji.

"Whoa, what's this?" Serena wondered, looking at the faded writing.

"I'm not entirely sure..." Amy said, bending over the page to read the faded writing. "'The Unown Dungeon was too precious to leave open, so I have sealed it until...' umm... 'I have need of opening it again.' Wow, this is really faded, I can't read much more of it. That there looks like it says 'signed Professor Samuel Oak'. That's the guy who went missing!"

"Hey! It's a treasure map! See? X marks the spot!" Mina exclaimed, pointing at a faded black X on the side of the mountain.

"Oh, wow! Let's go check it out!" Serena exclaimed, jumping to her feet.

"Serena, sit down. Do you have any idea how much money and equipment we would need for an expedition like this?" Raye asked.

"Oh, Raye, don't be silly. We can just transform and go there!" Serena said excitedly.

"I'm in," Lita said. Serena and Mina cheered and hugged Lita.

"I dunno... I've got a lot of studying to do..."

"Oh, snore, Amy! You can't spend the entire holidays studying!" Serena said, turning to her blue-haired friend.

"Yeah! Let loose a little!" Mina said, smiling.

"You're probably right. Mum did suggest that I tone down the studying a little..." Amy said.

"I guess it would be OK for us to go, seeing as we've sorted Chaos out," Raye said thoughtfully.

"That's settled, then! We're going to explore Mt Fuji and see if we can work out what happened to Professor Oak and his exploration team!" Serena said, doing a victory dance with Mina. Raye, Amy and Lita sweat-dropped. All of a sudden, Serena froze and asked,

"Can Darien come with us?"

"I don't see why not," Raye said, picking up the map to examine it more closely. It was then that Amy noticed more writing on the back.

"Hey, Raye, pass me the map for second," Amy said. Raye did, and Amy carefully laid it upside down, making it possible for all five of them to read: "The language that is carved into the altar is a very ancient one, but I was able to translate a little of it. It speaks of the Moon, Earth, Mercury, Venus, Mars and Jupiter. What significance this has, I cannot tell, but it is clearly a very significant discovery."

"Hey, that's all five of us plus Darien. Guys... Is it just me or does this seem like more than a coincidence?" Amy asked. The others frowned.

"It definitely seems to be about us..." Raye murmured thoughtfully.

"I think we probably should go check it out," Lita said. The others nodded in agreement.

"OK, we need to plan this out carefully before we leave," Raye said. "We'll definitely need Darien if the language really does mention Earth. And knowing Luna and Artemis, they'll want to come with us, and we may need their advice if we come across a new enemy. Serena, Mina, you two get in touch with those three and explain what's going on. Amy, have a good look in the library and on the internet and find out everything you can about Professor Oak and the cavern and this map. Lita, I'll help you take care of the food. We'll meet back here in 5 hours. And all of you, we may need our transformation items, so don't forget them. Especially you, Serena." Serena poked her tongue out at Raye before turning and running towards the temple steps.

"Who made you leader?" she called playfully over her shoulder.

"Wait for me, Serena! ...Oh, darn. I may as well go get Luna and Artemis, since she'll probably only go get Darien. See you in five hours, guys," Mina said, before running after Serena. Amy gently folded the map and put it into her bag, then headed towards the library once more. Raye and Lita got up and followed the other three girls down the steps.

"Ooh, this is so exciting! I can't believe we're actually doing this!" Serena said excitedly, bouncing up and down beside Darien.

"I know you're excited, Sere, but you need to save some of that energy for the trip," Darien said, his midnight-blue eyes twinkling.

"What's this I hear about a trip?" a voice said. Serena and Darien looked up to see Luna and Artemis walking up the Temple steps with Mina following behind them.

"Amy and I found a map hidden in one of the encyclopaedias in the Library, and it mentioned all of our planets. Not Amara, Michelle, Trista or Hotaru's, but everyone else's, including Earth and the Moon," Serena explained.

"Raye thought it would be wise to check it out," Mina said.

"Good idea. We're coming too," Luna said. Serena nodded.

"We figured you would," she said.

"Where's everyone else?" Artemis asked.

"Lita and Raye are dealing with food for the trip, and Amy's doing more research on Professor Oak and the cavern," Mina said. Just then, Raye and Lita appeared, carrying a huge picnic basket between them.

"Are we gonna have to lug that all the way up Mt Fuji?" Serena asked.

"Don't be silly, Serena. This was the only thing we could find that was big enough to fit all six backpacks into," Lita said, opening the picnic basket and taking out the pink backpack. Serena took it and opened it eagerly, finding all sorts of her favourite foods inside.

"We packed each backpack according to what you like, so everyone's happy on that, at least. I wanted to fill your backpack with salad, but Lita wouldn't let me," Raye said, pulling out two backpacks: an orange and a black. She passed these to Mina and Darien.

"Eeew, rabbit food! You're so mean, Raye! Thanks for saving me, Lita," Serena said, doing the backpack up again. Lita nodded and passed Raye her red backpack.

"Hi guys! Are we ready?" Amy called, walking up the steps with a thick clipboard in her hands.

"I think so. What'd you find?" Serena asked. Amy took the blue backpack that Lita handed to her and placed it at her feet before opening the clipboard.

"The exploration team that went missing consisted of Professor Oak and five teenagers - four boys, one girl - who were interested in seeing the cave. Those five were called Ash Ketchum, Tracey Sketchit, Gary Oak, Misty and Brock. I wasn't able to find out last names for the last two, and Gary Oak is actually Professor Oak's grandson. Apparently those five were the only ones who actually believed Professor Oak," Amy said, pulling out photocopied pictures of the five missing people. The six passed the photos around, looking at Professor Oak's greying hair, Ash's jet-black hair hidden beneath a red-and-white baseball cap, Brock's brown hair and tan skin, Misty's flame-orange hair tied in a side ponytail, Tracey's dark hair poking up over a red headband and Gary's spiky brown hair.

"I also found out that there was another teenage girl called May and her little brother Max who went missing looking for the team. Those two were apparently friends with Ash and Brock, and that's why they decided to go looking for them." The group this time looked at a picture of a tall brunette wearing a red bandana, her arm around a young boy with dark hair and glasses.

"In one of the books about Professor Oak's research, it was suggested that there was a map to the cavern, but it said that no map had ever been found, so this was only a rumour. But, as we very well know, the map does exist, and we're going to follow it to the cavern and see what we can find," Amy concluded, taking the pictures and putting them back into her clipboard, then placing the clipboard in her backpack.

"Well, shall we get going then?" Lita asked, taking the green backpack from the basket and putting it on. The girls nodded and put their backpacks on, then took out their transformation items.

"Moon Eternal Power!"

"Mercury Crystal Power!"

"Mars Crystal Power!"

"Jupiter Crystal Power!"

"Venus Crystal Power!" Pink, blue, red, green and orange lights flashed, feathers flew, and the five girls transformed into their Sailor Scout forms. Darien swung his backpack onto his back and smiled, then watched as the five Scouts held hands in a circle around him and the two cats. They closed their eyes, and each girl began to glow their respective Sailor Scout colour.

"Sailor Teleport!" The five girls chorused, before the eight of them vanished.

"Wow, you wouldn't think it was this hot on a mountain, would you," Sailor Moon moaned, wiping sweat from her forehead.

"Well, according to the map, the cavern should be just up there," Mercury said, looking up from the faded map and pointing up at an outcrop on the side of the mountain, roughly three storeys above their heads.

"Oh, great. How are we supposed to get up there?" Venus asked.

"How about we jump?" Darien asked, before picking up Luna and Artemis and jumping up to the place that Mercury had pointed to. The others smiled and jumped up next to him, and found themselves standing in front of a large boulder with writing carved into it.

"'I have sealed this cavern to protect its secrets. Only those strong enough will be able to uncover the mysteries within.' Wow, sounds like some pretty big mysteries to me," Jupiter remarked.

"Let's move it together," Darien said, before transforming into Tuxedo Mask with a flash. The six superheroes gathered on one side of the boulder and pushed, and the boulder slowly rolled to one side, revealing a dark cavern behind it. Four of the scouts, along with Tuxedo Mask stepped back to examine their achievements, but Sailor Moon charged straight into the cavern without waiting for the others.

"Serena, wait up!" Venus called. Sailor Moon skidded to a stop and ran back to the others.

"What? Why are you all waiting out here? Let's explore!" she said.

"Serena, who knows what sort of booby traps could be set up in there. You can't just go charging in, it could be dangerous!" Mercury said.

"Yeah, you Meatball Head! You could fall down a trap door and then we'd have to come and pull you out!" Mars said, her hands on her hips. Sailor Moon stuck her tongue out at Mars, but didn't run back in again. The six people and the two cats walked slowly into the cavern, where they quickly lost all light from the outside.

"Guess we could use a light here, huh?" Mars' voice said, before the passage was lit up by a flame that danced on the palm of Mars' gloved hand. Using this light, the group followed the passage deep into the mountain, the air getting hotter and thicker the further they went. Finally, they emerged in a small dark cavern. Mars held her flame up and noticed several torches on the walls, which she walked around and lit. As the light inside the cavern increased, they could see various images of strange creatures, along with an ancient, and strangely familiar, language written on the walls and on the altar in the centre of the room.

"Oh my!" Luna gasped, staring at the markings.

"What's the matter, Luna?" Jupiter asked.

"Do you realise what this language is?" Luna whispered.

"Well, ummm... I'm stumped. What is it, Luna?" Sailor Moon asked.

"It's Lunarian! It's what we all spoke back in the Silver Millennium!" Artemis said, staring up at the walls in amazement.

"What?" the others exclaimed.

"I'd heard a rumour that there was someone down on Earth who found a secret in a mountain, but I didn't think it actually existed. But here's the proof! It was all true!" Luna said.

"So what's it say, Luna?" Mercury said, walking up to the wall and rubbing her finger over one of the Mercury symbols carved there.

"'The other world shall open when,

The six foretold each hold their pen.' It's a poem. But this doesn't make any sense. 'The other world'?" Luna said.

"Well, I would think that by 'pen', it's meaning our transformation pens," Mars said.

"You could be right there, Raye, but Darien doesn't have a transformation pen," Sailor Moon said, looking sadly at her love. Tuxedo Mask smiled and detransformed, then pulled out a perfect red rose.

"I suppose you could call this my transformation pen, seeing as how I have to hold it to transform into Tuxedo Mask," he said.

"Hey, guys? Come have a look at this," Venus called from where she was bent over the altar, examining a beautiful ball about the size of an orange. The ball's smooth surface was divided in half, with the top half being gold and the bottom half being silver. The black that divided the two halves had what appeared to be a silver button set into it, and above the button, in (strangely enough) English, were the letters 'GS'.

"Hey, that looks similar to a picture in one of the encyclopaedias, except it was red and white instead of gold and silver. The caption said that it's called a Pokeball," Serena said

"It's so pretty!" Venus said, reaching out and attempting to pick up the Pokeball. After a few tugs, she realised that it was stuck in place, and stepped back to examine the rest of the altar. She quickly discovered a circular indent, four identical dome-shaped indents in the altar, each with a deep hole in the centre, and a single indent similar to the four, but smaller and more layered, and with a smaller hole. Venus brushed dust from around one of the four to discover the number 4 – Jupiter's symbol. She blew the dust away from the other five holes to find that each one had one of the Scout's symbols beside it. The smaller layered hole had a circle with a cross inside engraved beside it - the symbol of Earth.

"This has all of our symbols, you guys!" Venus exclaimed. The others crowded around to examine the altar.

"See? There's the symbol for Venus. I bet my transformation pen will fit in there," Venus said, before detransforming and holding up her orange Crystal Change Rod. She gently lowered the Rod into the hole with the Venus symbol beside it, noticing how nicely the Rod fitted.

"Go on, guys, put yours in too," Mina said. The others nodded and detransformed, then placed their transformation items into the slots on the altar. Darien slid his rose gently into the smallest slot, then stepped back. The six items began to glow softly, and then the Pokeball on top of the altar opened, releasing six blindingly-white globes of light. The lights flew around the room and then merged with the six items, changing them into Pokeballs similar to the one that the globes of light had come from. Each Pokeball was a different colour: Serena's had a hot pink top and a pale pink bottom; Amy's was fluorescent blue on top and light blue on the bottom; Raye's was red on top and orange on the bottom; Lita's was green on top and yellow on the bottom; Mina's was orange on top and gold on the bottom; and Darien's was black on top and white on the bottom. They each picked up their new items, and as they did so, the altar slid sideways, revealing a set of stairs beneath it. Luna and Artemis led the group down, with Amy bringing up the rear. Amy stopped after a few steps, then ran back and picked up the gold-and-silver Pokeball, which had disconnected from the altar. She slipped it into her backpack, then ran back down the steps after the others. The group descended into darkness again, so Raye created another flame to light their way. After what seemed like hours, the stairs ended and they entered a flat tunnel. They turned a corner and finally saw a spot of light. The group soon emerged into a peaceful clearing lit by a beautiful sunset, and they looked around in wonder at the emerald-green trees and the crystal-clear waterfall.

"Whoa, where are we?" Serena asked.

"I'm not sure, but we sure aren't in Japan," Mina said.

"Yes, and who knows what we'll find here," Luna murmured.