Using the Pokemon in the provided list, will you please come up with the best team possible (Pokemon Diamond)?

Uhh, I have Pearl. The team I'm planning on using for the Elite Four is Infernape, Floatzel, Chimecho, Staravia, Roserade and either Luxray or Gastrodon(probably Gastrodon). The thing is, there's a ground type in the Elite Four, which would make an electric type totally useless right there. In fact, there's nowhere in the Elite Four where you would particularly need an electric type (I don't believe.) And if I did, my Chimecho knows Shock Wave, so it's fine. Choosing from that list, I would take Empoleon, Roserade, Weavile, Garchomp, Moltres(or Arcanine), and uh... Whatever else you want. I havent battled the Elite Four on that game in a while, but I know the trainers are bug, psychic, ground and fire, so work with that. And Cynthia, the champion, has a Garchomp, so I'd have an Ice or Dragon Pokemon to take that down with. I've been playing Pearl for the past week or two and I'm one gym away from the Elite Four, so I hope this helped.