I know I haven't even started on my first Pokemon story, but that one still needs a lot of work for me to even start on and so for the time being here's this.
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Name:
(Y/N) (L/N)

Occupation:
Naranja Academy Student
Team Star Grunt

Likes:
Winning
Your Pokemon
Your mother
Sweets
Showing off
Cynthia

Dislikes:
Losing
People who abuse their Pokemon
Being thought of as weak
Schoolwork
Juliana (at first)
Penny (At first)

Biography:
You were born in the Alola Region and from a young age you were an arrogant, competitive dick with a superiority complex.

You took any opportunity you could to prove your superiority to others and put down any who challenged you.

It grew more intense when you became a Trainer and received your Starter, a Litten you nicknamed Jalapeños, though you never told anyone this in order to maintain your tough guy image.

You had hoped to compete in the island trials, beat the Kahunas and become Alolas champion.

But your mother suddenly decided it was time you both move to a new region.

Your Mother, Mitsuki:

Specifically to the Paldea Region to enroll you in Naranja Academy.

You were angry at first, but it didn't matter, all this meant is that you'd have to prove you were the best trainer in that region.

Once there and enrolled, you wasted no time and began battling every student there with your pokemon team from Alola.

It went well, you were dominating the entire school, until a certain someone came up to challenge you.

Nemona:

Her name was Nemona and apparently she was the strongest Trainer in Naranja Academy.

You accepted her challenge, knowing that if you defeated her, you'd practically rule this school.

While you did put up a good fight, you were ultimately defeated and you despised losing.

While Nemona was excited as she rarely got a challenge from anyone you were seething with rage.

The next day you ran into a group of delinquents picking on a younger and inexperienced trainer.

They were forcing him to battle and apparently if he lost he'd be forced to give these delinquents his pokemon.

That made you angry, sure you were brutal in battle and loved to brag, but you absolutely despised it when the strong picked on the weak.

You walked up to those delinquents and ordered them to back off.

They immediately recognized you as you put on quite the show yesterday, but since they were in a group they were cocky and believed they could intimidate you through numbers.

They challenged you to a 3 on 1 and you accepted telling the young trainer to leave which he did.

Safe to say, those bullies stood no chance, despite it being 3 on 1, you beat them easily.

Later that day while walking home you came across 2 weirdos wearing helmets saying they were part of a group called "Team Star."

Apparently they saw your battles and how you defended that trainer and wanted you to join their crew.

At first you weren't interested, but after thinking on it you decided to accept.

The reason you accepted was to eventually beat each of their Admins and eventually defeat their leader so that you could lead the group and rule the school with your underlings.

You promised this entire school would be under your your control and you'd beat Nemona.

So then all that was left to do was train your pokemon and become stronger.

You will not rest until you and your Pokemon head straight to the top.

Personality:
As stated before, you are an arrogant dick similar to the likes of Blue who takes every opportunity to prove his superiority.

You also have quite a temper on you and it's quite easy to piss you off, the quickest way being to call your strength into question.

You absolutely despise being thought of as weak and if anyone does this you will make sure they change their view on you.

During battle, you're loud, almost like a pro wrestler and want all eyes on you.

However, there is one person who can reign you in and that is your mother, Mitsuki.

She is a strict mother and just hearing her call you out is enough to make you change your tune and become less hostile.

You love and respect your mother for raising you, so she's the only adult allowed to talk down to you.

She knows you're a member of Team Star, but seems to not mind it.

And despite you being a rude jerk, you are quite intelligent and do actually care about your grades and attend classes.

You want to prove you're better than every other student in every field, even academically.

You are also surprisingly honorable when it comes to pokemon battles.

You won't resort to cheating and prefer to beat your foes fair and square.

In your own words:

"I don't need to cheat to win."

Cheating in your opinion is the same as admitting your weak.

You also really do care about your Pokemon and Pokemon in general and anyone who abuses their mons become an enemy in your eyes.

Some of the Pokemon you have are in fact with you because you helped them at one point such as your Mimikyu and Shiny Corviknight.

You also can't stand it when someone strong picks on someone weak.

You find it disgraceful and only find value in defeating someone strong and feel it is unnecessary.

Those who pick on the weak have no right to brag or boast in your opinion and if you see something like that happening you'll immediately intervene if you can.

However, this won't stop you from still being rude and insulting.

"Hey, come on! This guy's too pathetic to fight."

Are something you'd say when defending someone.

It's not you being ignorant, you mean to say something like that.

If they can't stand up for themselves at all in any way then they're pathetic, but you'll still intervene.

While you are a powerful trainer and aren't afraid to brag, there is one person you admire and hope to meet one day.

One person you idolize and hope to reach the level of.

Cynthia:

That person was none other than the Sinnoh champion Cynthia.

Cynthia was the very picture of strength, skill and very worthy of admiration.

You adored watching her matches, admired her strength and hope to become a champion to face her.

You developed a bit of a crush on her too and honestly...no one can blame you.

Theme:

Battle Theme: (Shooting Star Surge)

Alternate Battle theme: (The Scarlet Star Burns)

Final Battle theme: (Scarlet Supernova)
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There we go, your BIO is done and yeah, I made Mitsuki your mom.

She was the best option, plus all moms from Pokemon are hot.