By default, the answer to your question is B: while stabbing is possible, and seemingly-fatal injuries can be inflicted, the recipient of such lethal intentions will disappear before any confirmed "dying" can take place and they will wake up in the Pokemon centre, either unharmed or at the very least quite stable and on the mend. (This also applies to any self-inflicted injuries.... just for the record.)
Reality can be unpredictable here in Victory Road, though, so for players who don't want to play something of that nature (or simply for tone, or even comedy's sake), A and C are both options. Maybe your character inexplicably misses every time, no matter how skilled or sure the swing. Maybe they fumble the blade and drop it, comically, every time they try to get aggressive with it. Maybe blades dull the instant they're wielded at anything animate--that one definitely takes the stress out of chopping vegetables for soup! Whatever works for you as a player and doesn't violate the game's PG/PG-13 rating, in other words.
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Reality can be unpredictable here in Victory Road, though, so for players who don't want to play something of that nature (or simply for tone, or even comedy's sake), A and C are both options. Maybe your character inexplicably misses every time, no matter how skilled or sure the swing. Maybe they fumble the blade and drop it, comically, every time they try to get aggressive with it. Maybe blades dull the instant they're wielded at anything animate--that one definitely takes the stress out of chopping vegetables for soup! Whatever works for you as a player and doesn't violate the game's PG/PG-13 rating, in other words.
But as a rule of thumb, the answer is option B.