Interesting glitch: If you use an In-Training item and then accept a challenger's (! box) battle, it will ask if you want to join the cup or keep your in-training item. If you go ahead anyway, you'll fight the challenger 3x, get 3x of that massive easy experience, and STILL get the in-training item's effect on the first battle.
700,478' after hours and hours of play... It's noble to try and give your game longevity, but the core gameplay is too luck-based and ultimately boring to support the number of hours they tried to artificially inject into the game. The game gets much less fun when you're just trying to get 700k and every run takes >5 minutes.
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