I did have an idea where ogerpon's original partner did want to start a family with her but she wanted to take a walk to think about it and when she got back it was to late and was not able to give her answer to him. So after she killed the loyal three out of rage/sadness she kept pecharunt in its sleep shell form and used it as a golf ball and her cudgel as a golf club to make sure it could not sleep soundly to get some payback. She eventually hit swung to hard and lost it. So when the MC first beats her he could decide to lick the horns on her face (unmasked) and that was something her original partner did so she would think he reincarnated back for her and then gives the answer she was unable to give in time and will follow the MC even without the poke ball.