Pokémon diamond elite 4 team?

Infernape lvl 60 luxray is lvl 50 those are my top 2 hitters rn just caught all 3 lake guardians at 50 the rest of my party Pokémon are all around lvl 30 obviously planning on grinding them to roughly 20 levels higher if necessary but was wondering what my optimal team comp could be rn, obviously Infernape is a lock in I also plan absolving gabite and having him there as well, the rest are interchangeable for me with dialga looking like an optimal line up as well but not sure since he crosses with gabite in types. Would it be beneficial to bring both though too since dialga is steel and gabite covers ground? Haven’t played poke since I was like 10 so was jw.