I like the first part of your idea for her also just kind of makes sense that it could happen like that but the second part is where I have to disagree in the beginning for Percharunt of her story she’s actually quite loved by the elderly couple that looked after her, but in the middle, she kind of got her friends, the loyal trio killed by her actions because she just wanted to feel more love, I always saw her personality as a person that just wants to be truly loved and the only way she can think that she can be truly loved is by giving people their desires mind controlling them.
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It’s backstory stuff there’s a video that goes on the story of Pecharunt it shows where it lived for its first couple of years it also kind of shows how it meets the loyal trio and how they ended up meeting ogerpon
And in the game, it’s kind of explainable why Pecharunt was being such a dickhead in the games they just woke up after seeing their friends die and it probably just knows that with the passes of time that the old couple that looked after it is dead too, so it was probably just pissed and sad