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Write her as the best trainer in her small town, the town next to the MC's starting zone. She's happy go lucky and very proud, because she's on a winning streak, and challenges you expecting an easy win only to lose. Her early teams will be bubbly fairy and normal types. When you beat her, her reality shatters and sees you as a hurdle she must overcome to be the best trainer ever.
As the game progresses, her team changes more to fit her determined and jealous personality, with more dark poison and dragon types. You two take on the evil company of the week, fighting the antagonist together in a double battle. She realizes the error of her ways and knows how toxic a one sided rivalry, when you could grow stronger together.
She's obviously gonna have shipping moments that aren't really shipping because GF loves wishy-washy bullshit like that, and never committing to anything because it would be gay if you play as a girl