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.
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Then you beat them 100 times and win :)
Well,Level 70-100 Is A Good Level To Beat The Elite 4.
No, you can just train your Pokemon against wild Pokemon to level up. But it's a little quicker going against the elite 4 cos their Pokemon are higher level than wild Pokemon.
You get a legendary pokemon, to level 100 (trade it).
You get the symbol and 100 BP