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If you could change something about Pokemon battling to make it better (NOT perfect), what would you change?
I personally would remove any mechanic that makes it so you are unable to make a move. Full paralysis and flinching are the two biggest offenders here. The speed drop from paralysis is enough of a hindrance, but not being able to make a move is just not fun no matter how you look at it.
I'd also remove confusion and freeze, though those aren't as much of a problem as flinching and full paralysis. Sleep can stay because sleep in its current state is fine. Maybe change sleep mechanics so that Sleep induced by Spore always lasts two turns, while sleep from any other source can last from 1-3 turns like usual. Rest would stay the same, of course.