Backstory: Jin was lucky to be born, that's what they all said. Those were the first words he had ever heard. Jin was born as a twin, his twin being Kira Shino. From birth, all Jin knew was that he was weak. He was physically weak. His own body was frail and not good for much. But what he lacked in raw strength he more than made up for with his calculating and witty nature. He was smart to put it bluntly. Though it took a while for others to pick up on it, Jin was always praised by Kira for his intelligence. Growing up, the pair were always close. Jin always looked after his twin sister, to him she felt like the only one who could properly understand him. Though Kira wasn't the only one Jin was close to. Jin also had a brother. An older brother by 10 years. Which being honest, it's a massive age gap. The older brother in name was a boy called Kurou Shino. He was anything you could ask for an older brother. He was kind, smart, strong, caring and overall just a nice guy who loved nothing more than seeing the faces of his little sibling light up with joy. He was just that kind of guy.
As for Jin's parents? Well, that's not important seeing as they're both gone. At the age of 3, Jin, Kurou and Kira, lost their parents when they were caught in gang violence. Jin and Kira, they weren't really affected too deeply by this at their age. They could only ask, "when's mum and dad going to come home?" or "I'm sure they're going to come see us soon!". Though it would take a bit longer for either of them to understand it, but Jin was the first one to understand it between him and Kira. Though, this ordeal seemed to trouble Kurou the most. He wasn't really ever the same again. He was violent. He was bad tempered. He started to "discipline" his siblings with physical violence and when questioned about it he played it off as sibling love. Jin often times was the one who got it worse. He was punched, beaten, thrown around and he couldn't do anything about it. Tell his new parents? What were they going to do? Kick out Kurou? That would make Kira sad. That would make him sad.
For a while the three lived together under one roof, a friend of Kurou's parents decided to take them under their wings. Looking after the twins and Kurou. Though this was short lived too as 5 years later, Kurou left them. That final meeting with the three at a cafe. Everything seemed normal. It seemed like Kurou was finally coming to terms with the incident. The days running up to their final meeting was nicer. Kurou seemed back to his old self. He seemed normal again. He was giving them that love they used to have. But then he just left. Not a word. He was gone. This troubled Jin. For the next couple years, the Shino family were never really the same. Jin was guilt riddled about it. He blamed himself for Kurou leaving. He blamed his own weakness. It took Jin a good 3 years to finally find out what happened to Kurou. And though he may have never seen Kurou, the news about him was something Jin wasn't expecting.
Something you should know about Kurou, is that he's a very strong trainer. Being a pokemon trainer from the age of 10, he often travelled around but came home frequently before going out again. He was a strong trainer in his own rights. Now knowing this, what do you think a vengeful 18 year old would do with nothing to lose? If you guessed that he would take revenge on the gang you'd be correct! Kurou did just that and not only that but more. He didn't just take revenge, he ended up taking over the gang. Los Zeta, the name of his new family. His new home. But what on earth made this gang stand out from the others? Well to put it simply, they were organised. They knew how to make money. They knew how to inflict fear. They were feared for their strength. The gang itself was split into 3 parts. The Y unit that specialised in taking jobs from higher clients. They were often seen as a shady protection service. Then there was the X unit. These guys were often used as enforcers. Being paid to do gang attacks, fight other gangs, collect money. These guys were paid to be violent, the transactions often being done in secret. And finally there were the Zeta unit. These guys were the dark side to this gang. They did jobs that were almost always illegal, ranging from hits to dealings. They ran the underground fight club Rabios. This was a place where underground money was made in masses. How long did it take for Kurou to reform the gang into what it is now? 3 years. It took him. In those 3 years he's managed to establish a name for them, making them feared.
Now hearing this you'd expect a person who has just heard that their brother was now a wanted criminal to be confused right? Surprised, shocked, or something like that. But not Jin. He just... kept quiet. He just bottled it in. Jin knew what this would mean. He knew one day, one day his brother was going to fall from glory. He knew one day he'd mess with the wrong person. Though this news did do something good for him. It sparked a fire in him. An inferno that nobody was ever going to put out. One day, just one day, he was going to be able to join his brother. He was going to be there to protect him if it ever did go south. Be there with him so he would never be alone like he was during that incident. He wasn't going to be weak anymore. He was going to be strong. Stronger than ever before.
At the age of 10, Jin was gifted with his first pokemon. His starter. Who gifted it to him? Well, none other than his guardian parents. Both him and Kira gained the same pokemon. Rockruffs. Both Kira and Jin was ecstatic for this new event. They had their first pokemon! Though deep down they had different reasons to be happy. This was Jin's first step into becoming a pokemon master. At first when the pair went out to adventure, they went together. Jin and Kira both stayed together close for the first couple years. During this time it had Jin realise something. He was never going to be as strong as Kira. Her and her pokemon were just always stronger than his. maybe it was the amount of training and effort she put it, maybe him and his pokemon weren't able to keep up, but whatever it was... it was starting to become apparent. Jin needed to do something if he didn't want to be left in the dust and it soon became clear to him what he had to do. If he couldn't use raw strength to keep up with his sister, he'd just have to use his head.
It was during a fateful night, when the pair were talking about their brother, only then did they find out each other's motivations. Kira's motivation was to stop their brother from going any further, Jin's was to join him. It's safe to say that this lead to an altercation. The pair battled it out for hours. It was hard to say who won the match. Jin was knocked down and defeated while some of his pokemon remained. Albeit weakened. However, Kira was left standing. Her team were beaten but she was still standing, just a bit injured. This marked the splitting of the two. From there they went their own paths. Jin was hurt inside. This one hurt him more than anything. The one person who loved him for him, just gone. The one person he cared about most, just gone now. Though, this only fuelled his own determination. He was going to get strong enough before Kira, he was going to face his brother first so he could have Kira join them. She would join them, wouldn't she? Once she realised that the best thing to do was for the three of them to be together.
With this, Jin left the region. He went to a new one to start a fresh new leaf. His new temporary home? Hoen of course! Here he managed to catch a few more pokemon to add to his team. The gyms in Hoen were more so a breeze for him. With his small team of a rockruff, Noivern and Dartrix, Hoen really did help Jin grow up. It helped him grow into the trainer he was. As he went through the region, not every battle was an assured victory. He lost against gym leaders. He lost against others. But each and every time, he learnt to get better than his past failures. He gained new members to his team, evolved the few with him. Things were looking up. He had started to push through gym leaders, claiming all the badges. His goal? Get to the elite 4 and beat them. And he did it. He had managed to beat the elite 4, which only left the champion for him to battle. What did he do? Simple, not battle them. He ignored the champion. He wasn't going to win that battle and Jin never plays the losing game. He knows when he's going to lose and not gain something from it, so he didn't bother. What would he win if he lost? A small speech about getting better? A pat on the back? Plus there was the small chance that if he actually did win, what was he to do then? Become champion himself? Jin left Hoen, having been there long enough to be stronger than before. Much, much, much stronger than before. And now he was leaving Hoen, where to? Simple, to go to Sinnoh. That was his next destination. A place where he could start a new and work his way up again. He needed to get stronger. He was no longer going to sit around and be weak.