[Al nods with a sympathetic smile, giving Cheryl a long, considering look before he replies.]

You know, before I disappeared I had a Bulbasaur I'd inherited. Really stubborn little girl. She liked me, for sure, but she never did anything she hadn't decided for herself that she wanted. She was plenty high level enough to have evolved twice, but she never did.

[He pats Heather on her shoulder, and from atop Al's head Jill lets out a quiet mew.]

Whatever is keeping her from evolving, I doubt it's anything you've done.