Some people are just too optimistic. The residents especially; they're more caught up in friendship with Pokémon, living happy lives, and expecting everything to be made up of sunshine and rainbows. And then you have people from worlds that don't operate under those rules throwing a huge wrench in the whole operation.

[The Rockets brought in from the outside are ruthless. He has no idea how they compare to the natives, but given the incompetence of the police, he doubts they're more than bumbling baddies.]

And believe me when I say any Pokémon can take on a predatory battle role. Even living ice cream cones; it's all in how you train them up. If you're shooting for a full team, it helps to have different roles.