Nothing. Don't waste your time.
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Then you beat them 100 times and win :)
nothing
you get him after you beat the Elite Four 1,000 times. Trust me, it took me 1 year to beat the Elite Four just 500 times.
absolutely nothing.
i don't know but once you beat it 20 times you can fight proffessor rowan. he has lvl 100 torterra, infernape and empoleon. then your mom will give you every Pokemon you don't have.