well after you beat all the trainers and destroy the snowballs a good fighting or fire type should take down all of her Pokemon its not that hard
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beat the 8th gym
Ghost and dark type
I used my INFERNAPE,MACHOMP,STARAVIA,SHINX,MIVREUS and my hapiny to beat the fourth gym leader on Pokemon pearl.
In Pokemon Diamond, you get Dialga before the 8th gym battle. After you beat the 7th gym, you battle at the peak of Mt. Cornet, Spear Tower, and battle, preferably catch Dialga, then you can access Sunyshore City. In pearl you battle Palkia.
what do you do after beating the fouth gym in pokemon pearl