Can I have tips with beating the pokemon diamond league???

I think u should have pokemon at least level 75.....ur umbreon shouldn't have learned the move cut....u should delete it and teach it another move thats really storong, i won't tell u a move cause u might disagree with me...ur staraptor shouldn't know the move defog either! u should teach it brave bird or stell wing....teach all the hm moves to weak pokemon and put them in ur party when u really need it....but u should keep the moves surf,waterfall,fly,and strengh....cause they r ok.