You had your first pokemon at 5 fears old, a tiny and adorable female shinx that you named Nibi, she was by your side at any time, every time you fell and scraped your knee, or when you had a bad day, she was always there to cheer you up, as time passes, she never evolves, you don't know why, neither does she, but her power in combat did grow exponentially, eventually reaching level 100, she was textbook example of "don't judge a book by it's cover", but something was off, she kept leveling up past 100, which is impossible, then, when she reached level 137, she started to glow, was she evolving, was it finally time? Her body starts to grow, not change, grow, then it becomes more humanoid, and when the shining starts to stop, Nibi is now an anthropormophic shinx.
Nibi: in her cute and innocent tone master? What happened, did i evolved?