As a sneasel, she was very attention seeking, but the moment she evolved to a weavile, her behavior changed completely.
She became mischievous and doesn't listen to anything her trainer say. She's even causing trouble to my other pokemon up to the point, that she's actually hurting them. She eventually seemed to got back with her senses, as her trainer catched one of her attacks with his own body.
That put her in a shock, as this was the cause, that her first trainer had thrown her out of his team. His new trainer however, started to comfort her, making her getting clingy towards him.
Good, she does some pranks from time to time, but now she shows some respect towards the other pokemon.
PS: She likes to be cuddled by her trainer.