Yay! Finally done with this thing, I spent like a week doing it haha... so here it is my OC Rain 3-4 years after the UBF she's back with a whole new team, lifestyle and more to try her best at the Ohana Islands Battle Frontier!
Edit 2: Switched Sableye for Carvanha, added something in her personality and a hidden tiny thing in her alt. outfits </b>
Edit: Here's her and her pokemon's bio

Trainer info:

Rain was born on Kin Island (Three Island) raised by her mother in a small cottage along with her older sister. Always an adventurous girl, she got her first Pokemon at the age of 13 (an Eevee, now a Glaceon) while exploring the Berry Forest near her home; it was being attacked by some Tangelas. Since she grew up in a small island, she wasn't the strongest of trainers, but she finally got out when she caught a Lapras that was swimming at the beach. She traveled through Kanto, Johto, and Hoenn with her fellow Eevee.
When she arrived in Sinnoh she heard of a huge contest called the UBF and decided to enter just to prove herself. On her way to Snowpoint, Shiva, her Eevee, finally evolved into a beautiful Glaceon. While she was in the UBF she met Basil, another trainer, and became really close friends with him. And while she didn't make it past Round 3, Rain chose to stay at the UBF anyway as a spectator to support.
Later she bought a ranch in Solaceon Town, choosing breeding over battles. Everything was running smoothly at the Ranch; she even got a work buddy and roomy in fellow trainer, Cori. After some time, however, Basil decided he wanted to go explore the regions and learn more about Pokemon, wanting to become a Pokemon Professor. In his dust he left Rain a bit heartbroken. Not wanting pity from her friends, she became quiet and focused back on training. She began raising a Poochyena pup that had recently hatched at the ranch, quickly finding beauty in the dark type Pokemon. Inspired by her new favorite, she decided to train more of that type. After some months of training with her favorite pup she discovered a secret her best friend Shiz had been keeping, and still angry at Basil for "abandoning" her Rain decides to help Shiz with some business...
Now three years after the UBF, Rain has found out about a new tournament held in the Ohana Islands. And once more, she decided that she wanted to prove herself and show the world the brand new Pokemon team she had lovingly raised.

Pokemon

* Rajnish (Mightyena/Rash/Male): Hatched in Solaceon Ranch, Raj was the first dark type Pokemon Rain actually raised. He's a loving pup with both his trainer and Cori and overly protective of them. He has a rash nature and trusts his instincts in battle. He's the "leader of the pack."

*Lucy (Fearow/Careful/Female): Lucy was once Cori's paranoid Spearow, rescued from a neglectful trainer. She took a liking to Rain's training sessions, so Rain asked her if she'd like to join them. After some time the little Spearow evolved into a majestic Fearow and Cori let her stay in Rain's team, officially making Rain Lucy’s trainer. She analyzes the battle field and then launches a powerful and accurate attack.

*Freyr (Sharpedo/Jolly/Male): Freyr was once a troublesome Carvahna. Rain found him while visiting the Great Marsh in Pastoria. She had actually been looking for a Scorupi, but when she had gotten a Poffin out to try and befriend one, a huge, HUGE Carvahna jumped out of the water and ate it, all the while sending a very frightened Cori into the marsh.
Rain decided to capture it and now the Sharpedo loves to chase people in and out of the water. He's savage in the battle field and never lets himself be switched out of a battle.

*Daedalus (Weavile/Bold/Male): Caught as a Sneasel on Route 116 while searching for the beacon during the UBF's 2nd round. This shiny Weavile is always ready for battle. Since he has been around longer with the team, he's constantly challenging Raj for the title of team captain. He uses his speed in battle, tiring his opponents before using a powerful attack.

*Drizzle (Carvanha/Calm/Female): Drizzle has not been with Rain for a long time, she is a really tiny carvanha that a very close friend gave her… when she decided to "help" her with some business… Drizzle likes to be in double battles and she usually uses her Rain Dance attack when Rain's feeling either angry or sad.

*Kachee (Barujiina/Adamant/Female) Kachee is Rain's most recent Pokemon. She was sent as a gift from her sister who's currently living in Hiun City in the Isshu region. Rain almost squealed when she saw the vulture chick come out of her pokeball. Kachee is not really an evil Pokemon, despite her threatening looks, but she does enjoy battles.

Pet Pokemon:

*Oni (Zorua/Naughty/Male): He's Rain's baby and he knows it. He can do whatever mischief he has in mind and knows his trainer is not going to be mad at him. He can often be found using his Illusion ability to mess with people. He especially loves pranking poor Cori. He loves being brushed and is quite vain.