u/Sea_Explanation_3027

Ok so I am training my Pokémon for the league in diamond and my team is, infernape, staraptor, Luxray, garchomp, floatzl, but for my sixth Pokémon should I use steelix or dialga? Dialga is level 47 and steelix is 46, also should I trade out my luxray? I already have dark coverage with floatzl that has crunch and it seems like electric won’t be too important since all my other Pokémon have good coverage