Well, we'd have to think about how the crown's reputation grew. By the time Miakid comes around the power that the crown grants you is legendary, and many robots are sent to obtain it.
So I suspect that the previous rulers of the crown used there power to try and spread their influence over the earth, perhaps abusing the Mimigas like the docter did (although this is unlikely, since Jenka has been in the island since the begining, and only tells of one tragedy involving the red flowers, they probably wern't known by the humans at that point).
that being said, I have a couple questions to expand on this:
1) What is the first crown bearer? It doesn't look... human that's for sure. (it has a tail!)
2) how did it find out about the crown in the first place? Perhaps it was a native inhabitant?
3) (a bit unrelated) why were the robots (team 9) trying to destroy the core? It certainly doesn't have anything to do with finding the crown, which as I've picked up, was the purpous of the robots... maybe they were like Quote and Curly...?