Hmmm....the worst thing, you say? Welp, it happened to my old Silver version. Those of you who played Silver/Gold/Crystal should know that Dunsparce is a very rare Pokemon there. When I finally found it, I did the usual catching technique, stunned it, false swiped a few times, then threw a great ball. I caught the thing, but then my game suddenly went haywire. It had a loud sort of "beeeeeeeeeeeeeeeeep" and the game froze. When I restarted, they said my save file had been corrupted....which is weird because I din't save after catching that Dunsparce. To this day I consider a Dunsparce a jinx,(no pun intended) if it wasn't enough that it was weak, it also HAD to screw my game up....