I encountered a Pokemon in the wild and it gave off this weird sprite and said,"A wild tympole appeared?!"It was not shiny.It was the same color.Then it said it had a different OT???
Okay, I was pretty sure that it was N's Tympole before, but now that you say it had a different OT, I am nearly positive. You have encountered N's Tympole
Did it have sparkles? If so, it was shiny. I hope you caught it, because Shinys are very rare. They aren't stronger or anything, but they have a different coloration than most, and earn one bragging rights.