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to fight her for her badge, you either have to donate one megastone or three super rare and out of the way items from bumfuck, nowhere that's useless outside of this instance
also, because this game is coded like shit, you can accidentally end up giving her all of your mega stones if you donate any past the first - from what i understand this might actually be intentional, but she gives you nothing for them
as i have a few useless megastones, it's an easy choice
