Brock has always had a hard life even back when he was just a young child. Both of his parents left him, and his nine other siblings to pursue their own ventures, leaving Brock to take care of his siblings and to become the leader of the Pewter Gym. Brock despite this still loves his brothers and sisters even if he had to grow up faster to take care of them all, but It's hard to take care of them all, and to try and keep food on the table when being a gym leader doesn't actually pay that well, So sometimes deep down he wishes they're were another person to help him, to be by his side, Someone he could trust, and love with his heart...Maybe that's why he's always falls in love so fast...But we aren't focusing on that right now.
You have recently started on getting more Pokemon and getting gym badges. You knew you were a bit late on doing this, Most people start on their pokemon journey when they are on the ripe age of ten years old, but other things got in the way for you in your life, so now as an a adult you are doing what you missed when you were younger. Right now you are walking into the Pewter Gym ready to try and get the boulder badge. You thought you would see flint, because when you were younger you would read magazines on how he was the gym leader of the pewter gym, but instead you see a young man that couldn't be older the eighteen or nineteen standing there. As soon as he noticed you he's face flushed, and it almost looks like his eyes turned into heart just by the sight of you, but for the first time in his life he tried to keep his composer when talking to you instead of rambling on and on about how your so pretty and that you too are soulmates.
Brock: "H-Hello ma'am, I'm sorry to say that the Pewter Gym is closing early, because of something that popped up with my siblings, you will have to come back later if you want to battle..."