I see you found Pearl right after she evolved. As the description states, even after she evolves, she keeps her childish, bubbly personality. Actually I believe she gets a stronger mischievous side when she first evolves, but subsides as she forms into the older version of herself, which is the first celesteon picture I submitted.

Good observation of the different eeveelutions. That will be explained when Pearl finally evolves at the end of next Arc.

How could I not find her after she evolved? That thumbnail was just too "Daaaaaw" and besides, I'm finding out whatever I can about the story before it get's too heavy.