Point is, it's very natural for people to use pokemon for protection or traveling. As for actual fights, you might view it as some type of competition. Pokemon don't usually get injured beyond a trip to the health center, and, it's used as a bonding mechanism. Pokemon seem to enjoy battling and view it as a sport. It's only the bad trainers that taint the friendly competition for everyone else. As seen with their hostility in the tall grass, fighting is a very natural genetic trait for pokemon.

[ No. Lust is cheap. 8|aa ]