80-75 my opinion ANSWER in fire red i did it with lvl 70 charizard and some others.
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Well,Level 70-100 Is A Good Level To Beat The Elite 4.
red or the elite four if you beat red the elite four Pokemon will be jacked up or red again after you beat the elite four his Pokemon are the same levels as before
I would suggest having your whole team above level 50 so you have a chance to beat the Elite Four. I think the Elite Four Pokemon are at level 50-60, so well trained level 50 Pokemon will be good for the elite four.
You get a legendary pokemon, to level 100 (trade it).
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.