Rissi – Moves from Kanto to Alola and finally begins her pokemon journey at the age of 16. Loves loves loves to dance and all of her pokemon learn her "signature" move (a spin with a dab at the end). Rissi's story basically followed along the storyline of Pokemon Ultra Sun, I just put my own spin on the OC :P She was supposed to end up with Gladion in the end, but I don't remember too much of the details about this one

Decidueye – Starter Pokemon. Has a deep sense of loyalty and a desire to make Rissi's dreams come true. He is one of the most active of Rissi's dance partners. As he evolves from a Dartrix to Decidueye he gains more and more maturity and a sense of protectiveness for his trainer that causes him to try and chase off potential suitors.

Lycanroc – Was treated extremely poorly by his first trainer and eventually runs away, developing a hatred for all people. Rissi stumbles on Rockruff on her way towards the first Trial site. Rockruff immediately initiates a battle to try and scare her and Rowlet off, but instead of fighting back, Rissi and Rowlett use their dance moves to dodge all of Rockruff's moves. Rockruff finds this so odd that he stops battling and slinks off to watch them silently as they continue to travel through the island. When they were struggling against the Totem Raticate, Rockruff feels a strange desire to help and rushed out to take out Raticate's helper pokemon that he called into the battle. Rowlett defeats Raticate and Rissi asked Rockruff if he would join them. Rockruff reluctantly accepts but he despises being inside his Pokeball so Rissi always lets him roam free. Even after evolving into a Lycanroc, he still hates other trainers, but he becomes fiercely loyal to Rissi, aiding Decidueye in his desires to protect her.

Gyarados– Rissi catches Magicarp while fishing after defeating the Totem Araquanid. Rissi trains Magicarp by teaching him dance moves together in the river. Magicarp slowly begins to show more cognizance as he learns more and more complicated dance steps that translate into moves. Eventually, he evolves and as a Gyarados he is incredibly intimidating. He learns many moves from different typings, and thanks to RIssi's dance training is much more nimble than you would think a giant Gyarados could be. He carries Rissi and Lycanroc between the islands because Lycanroc hates being in his pokeball so much and he makes the people on the Ferry uncomfortable with his constant growling.

Vikavolt - Rissi fell in love with how adorable Grubbin was and caught the first one she could find. Grubbin evolved very quickly into Charjabug and even though he was basically the shape of an accordion, he still managed to follow along with Rissi's dance moves. When they went to visit the power plant though, a wild Graveler charged in to attack Rissi and her team when a power surge sent out an electric pulse and made it go wild. The overcharged and crazed Graveler was causing a ton of destruction, but Charjabug bravely faced off against it and when he was knocked back he evolved into Vikavolt. A few sparks from Vikavolt helped the Graveler sluff off his excess electricity and calmed down the raging pokemon. Vikavolt, now that he had wings, loved to put his own spin on Rissi's dance moves and he was a fun-loving pokemon that loved to battle.

Mudsdale - After Vikavolt evolved Rissi and her team were making their way down the mountain when they came across several Mudbray all ganging up on another Mudbray that was much smaller than normal. Rissi and Decidueye wasted no time getting rid of the bullies, and after making sure the Mudbray was alright they made as if to leave. However, as they traveled, the grateful Mudbray followed right after them, and Rissi decided to capture it. Even though Mudbray was smaller than normal, he had the ability of "Stamina" which meant whenever it was attacked his defenses went higher, making him a difficult pokemon to best in the right battles. When he evolves into a Mudbray, he shocks everyone by becoming more than half a foot taller than the average Mudsdale, which made him very happy.

Ralts - One night as Rissi and her pokemon team practiced their dance moves late at night, Lycanroc suddenly began running into the forest. Everyone followed after him and they eventually came upon a Ralts that had been caught in a trap set by some Team Skull thugs Rissi, enraged by their cruelty, set her pokemon on them and they ran away screaming bloody murder. Lycanron freed Ralts from the trap and after spending the night tending to the little one's wounds, Ralts became attached to all of Rissi's pokemon, but especially Lycanroc. It wasn't uncommon for Ralts to ride on Lycanroc's back as they traveled throughout the islands.

(Obviously I had a thing for Gladion since two of my OC's ended up with him :P)