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Just played it on an 3DS XL. Here are the facts:
In some trainer battles, the game may slowdown a little once both Pokemon and trainers are in the screen at the same time, but only when you're choosing a move. You know in how the game slowed down back in the battle maison whenever you where choosing a move and there was a whether effect like sandstorm? Kind of like that but not as bad. Once you choose a move, the game goes back to normal.
The only thing that really fucks up the framerate real bad is the photo minigame and the totem battle, but that literally happens in both o3DS and n3DS. You could go out right now and buy the newest n3DS and it would still run like shit.
Overworld runs flawlessly. Pikachu's Z move has no framerate drops. The 3DS doesn't get hot either, that's just bullshit.