Having rouble beating candice in pokemon platinum , Plz help?

DO NOT USE STARAPTOR, ROSELIA OR GABITE AGAINST THE GYM LEADER!!! Evolve Roselia because its not gonna learn anymore moves now. If you level up Gyarados to Lv. 40-45ish, use Bite on her Frosl and you will be able to take care of her. Vespiquen's Power Gem will also be effective against her Pokemon.