Rate my pokemon platinum team!!!!?

sounds like a nicely balanced team... however im not a big fan of using legendaries in my main party but if it works for you have at it. and as for your last choice... gibble sounds good garchomp would be a great addition they are strong and fast. i like breeding them, some i use in trades ,people love to see things like that on gts lol! ... ps b.t.w.... if i were you i would make some good use of empoleon's dual types ... water and steel... throw in a steel move and it will be a beast!