using a powerful water and grass type
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the pokemon you could use to defeat her is electric types or rock and ice
you need to beat clay. and in order to enter his gym, you need to defeat team plasma in the ice storage (or something) south of driftveil.
Well you defeat alder and he will register your pokemon on the hall of fame. After that you have to find all seven sages including ghetsis.
shes with alder at the bell
use ice and dragon type