>>43574194Normally is typically just unskillfully throwing your weight around, fighting is a more skillful and intensive application of real life fighting moves.
Any one can body slam, not anyone can successful pull off a high jump kick and the added precision gives it more offensive strength against breakable types (Rock ice steel) the unskilled (Normal) and those who fight dirty (dark) and gives added ability to combat against dirty tactics (resistance to dark)
One of the few types I think is 100% logically consistent and well applied to pokemon and has good variety. One of my favorite types