"There a certain very rare and very powerful pokemon often described as 'legendary'. Needless to say, there are those who seek them for one reason or another. And so there's been a time or two in the past where some organization has succeeded in locating and perhaps even attempting to capture one... but without considering or planning for the side effects of such an ill-conceived plan."

Which usually meant everyone else had to pitch in to clean up the mess, before freak thunderstorms drown everything or something like that.

"Perhaps needless to say, none have ever succeeded in the end, though that doesn't mean they weren't able to cause trouble in the meantime."