I once rented a Pokemon Black game.
I had a Level 37-45 Emboar, and a few other Pokemon. I was stuck at the Mistralton Gym, and Emboar was my only reliable Pokemon so I started to train him. Later, I turned in the game and someone else rented it. I got the game back, and a few things were off. I battled Pokemon on Route 7 and I Only gained 6 Exp Points. My Zebstrika had an Exp Share, but still...
I also flew Back to Accumula Town and Walked to Route 2, but the trainers that supposedly cannot be skipped battled me.
How did this happen?