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I turned off the XP share the minute I got it. I have no idea where all you guys are getting so much free XP from, I fought the 6th gym (level 40's) with five mid 30's Pokemon and came out with an easy win despite never using a Poison or Steel type move. I've been underleveled compared to what should be easy trainers on various routes - in general my Pokemon are usually a level or two higher than the surrounding wild Pokemon.
I'd really like to see how these "level 90's before E4" are playing, because I don't see that happening at all in my game.