I ned help raki out cynthia I have platinum?

First,Cynthia's pokemon are:Spiritomb,Togekiss,Lucario,Garchomp,… strategy is this:use anything on spiritomb,take out togekiss with ice fang,fire blitz on lucario,ice fang on garchomp,same with roserade,and for the grand finale:leaf storm on milotic. Glad I could help.