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When I beat the Elite 4 my first time, my Pokemon were all in the lower 40s. I didn't need a bunch of items really, I just used a few Super Potions after each battle. Plus I gave some of my Pokemon berries so they wouldn't get a status effect.
This is a nice thread, however we actually already have one here to list your teams. It's best you use that to list your team used for the in-game as well as the Elite and their levels. You can also share you adventures and stories in the game in the Travel Journal we have stickied.