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A dark type pokemon is a fighting type's evil twin
A fighting type pokemon will bravely charge into battle, confident in its skill, they battle down opponents with precise moves and fighting wit. If they lose, they can learn from their defeat, discover a weakness and train to become better at it.
Dark types do not care for such novelties, they will gladly do everything in their might to win, including throwing things, sneak attacks, bringing weapons forehand and tricking their opponents to, should need be, they will resort to biting and eye poking, sometimes even trying to cheat their enemy to give them a chance.
Dark type pokemon are not evil, they are inexperienced and cowardy.