I had a hard time on this one. First you have to beat all the gyms you can and the Team Galitic HQs. after that I think she should be there. Correct me if I'm wrong. It was a long time since I beat her.
Chat with our AI personalities
At this point of the storyline, you are supposed to go to pastoria city
a staravia or any Pokemon with intimadate will help and use pyschioc type moves and battle strong!!!!!!!
The moon stone is used in Pokemon Diamond to evolve certain Pokemon. You can find one by looking in the Underground.
You can find Aron only in Diamond.
No. A hippo isnt a pokemon.