A girl finds a strange looking pokeball on the ground. It looked like it was leaking some sort of strange blue goo. Curious, she steps closer, and then suddenly, the pokeball opens, releasing a ton of blue ooze onto her! She struggled to pull it off, but it just got stuck to her hands. As it spread up her body, she looked at a huge accumulation of goo stuck to her backside, resembling a finned tail. Despite her efforts trying to shake off the goo, it kept spreading. As it covered her head, she felt fins start to grow, replacing her ears, and one on top of her head. She opened her eyes, and in shock, saw that she was now a vaporeon, still dripping with that strange goo. What was in the pokeball???