How do I beat Crasher Wake in pokemon platinum with my party?

you have a pretty good and balanced team, but i'd give up one of the bug pokemon and get a water and ice type. anyways onto the subject; kirlia and roselia would be the ideal pair to defeat crasher. i wold suggest starting the battle with kirlia, but train it first. if you have the vs. seeker go back and fight old trainers, and if you haven't beaten the trainers in cycling road, then go back and defeat them. in my opinion, starting the battle with roselia is a bad idea because remember; crasher wake has a gyrados, water and flying type. kirlia's shock wave can take him out, which is one HUGE load off your back. good luck to you and your team. :)