Well, basically all the stuff I told Anlu... speaking of whom, that app is accepted... though, I guess I should tell you that there are some species of normal birds, fish, and bugs which are TYPICALLY eaten by pokemon instead of other pokemon. Now, keep in mind that I said TYPICALLY. There are some that, well, don't do that, and a completely wild pokemon (As in, one that's lived in a mystery dungeon for a while) would probably end up doing that sooner or later, anyways due to the effect it (that is, remaining wild) has on their mind.