It may seem weird, but try taking out one of the elemental fangs for leer. keep ice fang, actually, since fire fang doesnt really give you much type advantage. Also, if you're using luxray in doubles, you'll find leer is really useful as it affects both opponents. the life orb sounds like a good Idea to me, but the white herb is a viable option, as yoda said. (or at least, thats all what me thinks and what I'd do. The rest is up to you)