Please give me some Pointers for my Pokemon Diamond Competitive Team(Im new to Competitive Battling)?

O WOW I AD THE EXACT SAME TEAM so i will give u a really good answer.SCIZOR-he is pretty good like that but if u can replace x sissor with u turn.CROBAT-awesome like that.DUSKINOR-hmm replace shadow sneak with shadow punch because some people really love the move double team (including me).MAGMORTAR-very good like that because he can type trump many types with that moveset.ROSERADE-well if its a girl keep attract becasue of more often male pokemon but if its a male get rid of everythin ecxept for giga drain and give it shadow ball,sludge bomb,and another really good sp attack becasue roserade is a real good sp attacker and might juss have the decent speed to get a one hit KO.EMPOLEON-well i guess either one is good because if u juss so happen to go up against a water type u can use roar so i think roar and also becasuse (i dont know this for sure)if u usse roar while stealth rock is in place it will do damge so u could jjuss roar and roar and roar :).ok well try not go with magnezone becasue of all the ground types but of course (duh) i guess thats whhy u gave it mahnet rise but i would go with a solid elecric type like or go with an anoyer like ur duskinor could make a good annoyer if u keep will-o-wisp and give it mean look and nightshade ( only if level 100)and confuse ray.but i guess if u dont want to make duskinor an annoyer or u juss dont want an annnoyer get an electervire knowing light screen,thunderpunch (becasue its attack is better then its sp attck),iron tail and the last move can be ur choice.ok hope i was of some help and plz make me best answer becasue i know it juss has to be cuz i AM the pokeon master :)