IVs, I don't really worry about, since there's not much you can do to change them, anyway (that I know or care of). Natures, I knew about briefly, but quickly forgot. I guess the "if you breed it and raise it from scratch, it's stronger" thing is just a false notion of mine, but I don't really take the stats stuff that seriously. I just want to catch cute and/or cool animals and make them assault each other.