Rare as it is, there are a myriad of reasons why a pokemon couldn't be used.

"Got it." And with a nod, she's off, following the directions with ease and it soon becomes apparent that Eva is used to thinking fast on her feet to avoid things and every now and then, there's a flash of cunning as she calculates and adjusts as needed.

She makes it through with a final jump and turns an awkward landing into a roll with an adrenaline-filled laugh. "Thanks."