Even so, pokemon arn't really intelligent or powerful enough to destroy a death star. Not to mention, everyone in the pokeverse is too nice and happy and all sunshine to kill a single person, and destroying a death star would surely kill at least one person.
Are you sure about this? Of course, killing people isn't necessarily mentioned in the games or the show because it's directed towards kids, but I bet somewhere in that world, there's some psychopath using a Gengar or something to kill people.
Plus, I'm sure with the spacey Pokemon together, they could easily blow up the Death Star.