Quoted By:
Part 2: (HeadcannonHighway)
Say you choose to be Simon, and pick Foliat. Sofia picks Kidling, and you battle with your starters. Just like the games. You win/lose then head out, Mangrove says something about seeing your mother/father off. Not able to leave the town until you do so. Mother heals your Pokemon and Father gives you potion/few pokeballs or whatever.
Now Programming wise, talking to your parents would then trigger the event. When you head outside you see commotion; Mangrove, Sequoia, and Sofia are standing near the entrance to Route 1. Sofia's Kidling was just stolen by a mysterious traveler. Could be something about how it was still weak from the battle with you. And the traveler had this strong ghostly cowboy Pokemon, and took Kidling from her. Something about them going back to the Lb to get it sorted out.
Now you can head down Route 1 and start your journey. You are able to go back in the Lab if you would like, could be them discussing what to do. May or may not reveal that they are giving Sofia Aguade. And so you go about your journey, beating the first gym and making your way through the forest and onto Crossroads Town. In this town being the Salon where you will first meet Ricardo. Maybe when you interact with him, he says you spilled his drink and he battles you. He starts off with one of the other Pokemon on his team then sends out Somberado and finally sends out Kidling. Its all coming together now. After the battle he reveals that it was him who stole Kidling and now has a vendetta against you. And will be your main rival through the game.
Later on at some point, maybe even before the Salon event, you will see Sofia and battle her. She now has Aguade and is doing well training up her Pokemon. She is more in it for the adventure and forming bonds with her Pokemon instead of trying to become the best. She will be your friendly rival throughout the game.