Starting with the story from the very begining

Your a pokémon that once used to have a abusive trainer, sometimes the abuse would be worse and worse.But luckily your former trainer was caught and arrested now facing jail for life.You were taken in a pokémon center to be healed and later on put for adoption.And thats how you ended up in Ash's team.

Its been two months now and Ash is today training his pokémons getting ready to get his first gym badge ever, he isn't using you in the battle because he knows you went trough a lot from what he heard from the pokémon center he adopted you but he is not aware that his kindness over you has just granted him a life time best friend.

(Feel free to choose what pokémon you want to be from gen 1 to gen 9, i will update if gen 10 will ever exist!Meanwhile choose what pokémon you are)