DISCLAIMER: I do NOT own Pokemon or Undertale. They belong to their respective creators. I only own the plot! This is basically Undertale but all monsters are Pokemon, including Flowey. Frisk and Chara are still humans.

Long ago, two races ruled over Earth: HUMANS and POKEMON.

One day, war broke out between the two races.

After a long battle, the humans were victorious.

They sealed the Pokemon underground with a magic spell.

Many years later…

Mt. Ebott, 201X

Legends say that those who climb the mountain never return…

And now, our story begins…

Frisk woke up, and looked around them. They were surrounded by flowers. Golden flowers that they had once seen on the surface. They were growing on the patch of grass they were sitting on. Everywhere else just looked like a cave. They tried to remember what last happened.

From what they could remember, they were falling. Falling from a hole in Mt. Ebott. They climbed it to get away from their parents. Get away from society. They wanted to die. Frisk started to wonder if they were dead. They checked to see if they were breathing. They were still breathing and definitely alive. They let out a sigh.

Frisk started to wonder how they survived the fall. Sighing, they got up, and started to look around for a way out. They saw one passage. If it was the only way to go, they might as well go, to see where it went. At the end of the passage, there was an arch made out of grey marble. There was a symbol on the top of the arch, but Frisk didn't know what it stood for. They went past the arch, and came into a dark room.

In the middle of the room, on a patch of green grass, was a flower-like creature that resembled the golden flowers. It had several short, golden petals, and a pale yellow center with a smiley face on it. It had a green stem-like body with two leaves, along with two stubby legs and long feet with two toes on each of them. Frisk assumed it was a Pokemon, creatures that they read about it legends.

"Howdy!" the Pokemon greeted. It had a high-pitched voice, but Frisk could tell it was a male Pokemon. "I'm Flowey! Flowey the Sunflora! Hmm… You're new to the Underground, aren'tcha?"

Frisk nodded in response. He seems friendly… Maybe he won't hurt me? they thought.

"Golly, you must be so confused," Flowey said. "Someone ought to teach you how things work around here! I guess little old me will have to do. Ready? Here we go!"

Suddenly, a red heart appeared in front of Frisk's body. "See that heart? That is your SOUL, the very culmination of your being!" Flowey explained. "Your SOUL starts off weak, but can grow strong if you gain a lot of LV. What does LV stand for? Why, LOVE, of course! You want some LOVE, don't you?"

Frisk nodded in response. They started to wonder how they could get LOVE.

"Don't worry, I'll share some with you!" the Sunflora exclaimed. He winked, and said, "Down here, LOVE is shared through… Little white… "friendliness seeds." Are you ready? Move around! Get as many as you can!"

White seeds suddenly appeared, and they began to go towards their SOUL. Frisk's SOUL ran into the friendliness seeds, and they suddenly felt a great amount of pain throughout their entire body. They grasped their chest in pain and agony. Flowey's face turned into an evil smile, with a large, toothy grin and large, white pupils.

"You idiot," Flowey said. "In this world, it's kill or BE killed. Why would anyone pass up an opportunity like this!?" The seeds began to circle around Frisk's SOUL. "Die," he said. They began to close in on their SOUL while Flowey laughed maniacally. Frisk could not escape. They would die right here, underground.

Suddenly, the seeds disappeared. Flowey looked at what happened in confusion. Suddenly, a fireball hit him, and he was sent flying off, screaming in the distance. A tall, bipedal fox Pokemon then approached Frisk.

The fox Pokemon had mainly yellow and white fur, resembling a fox. It had large ears with large, red tufts coming out of them that resembled fire. It was wearing a blue-purple dress with a dark blue-purple area on its chest, resembling a shield. In that dark blue-purple area was the same symbol Frisk saw on the arch – a white circle with wings coming out of it, with two small triangles on their upside, with one upside-down triangle below them. The dress had white sleeves, and the Pokemon's hands and feet were black, with three digits each. Frisk could see some red fur coming from the bottom of the dress and the end of the sleeves. It was clearly female.

"What a terrible creature, torturing such a poor, innocent youth…" she muttered. She then looked at Frisk. "Ah, do not be afraid, my child. I am Toriel the Delphox, caretaker of the Ruins. I pass through this place every day to see if anyone has fallen down. You are the first human to come down here in a long time," the Pokemon explained. "Come! I will guide you through the catacombs."

Frisk nodded, and said, "Okay!"

Toriel gestured for them to follow her. "This way." She turned around, and started walking in the opposite direction. Frisk followed her into a purple area that appeared to be ancient.

This must be the catacombs… they thought. I can trust Toriel… right?

"Welcome to your new home, innocent one," she said. "Allow me to educate you in the operation of the Ruins." The Delphox walked on a series of buttons, and flipped a yellow switch. Frisk heard a clicking sound, and the doors in front of them opened. "The Ruins are full of puzzles. Ancient fusions between diversions and doorkeys. One must solve them to move from room to room. Please adjust yourself to the sight of them."

Toriel headed out of the room, and Frisk followed.

A/N: So, here is my new fanfiction. I will try my best to update every day. This will follow the plot of Undertale, and each chapter is a certain section of the game. For example, this chapter is the first encounter with Flowey and the first room in the Ruins. So, they may or may not be short. The next chapter will be the rest of the Ruins, not including Toriel's home and the boss fight with Toriel.

Now, you may be wondering why I chose Delphox to be Toriel. Well, I wanted it to be more similar to Pokemon, so I considered Toriel being a Fire-type Pokemon. Nidoqueen can not breed, considering that Toriel's child is Asriel, and Gogoat could not learn any Fire-type moves other than Sunny Day. An image I found on Google also influenced my decision, since they made Toriel a Delphox. Unfortunately, that means that Asgore would also have to be a Delphox, considering than they were both goats, and Asriel would have to be a Fennekin.

Hopefully, that can clear some things up. Branchwing, out!