Kindrindra
大事なのは自分らしいくある事
Dark types could be the opposite. Think almost like the holy monks of the Pokemon world, temple guardians and such. They should have a fu dog Pokemon.
You misunderstand. Dark already has an opposite. It is the type of cheaters. Biting someone can hardly be considered a fair tactic. Neither can running after a fleeing opponent. Springing an ambush as the foe's about to attack? Stealing their weapon? Hardly fair. Calling them names? Preventing them from getting help?
The opposite of the dark type is the fair and just duelists; The Fighting type.