I try to catch each pokemon in a different ball. 8D </dork> I would say that I use Quick, Heal, and Ultra Balls the most though.
I would use Dusk Balls, but for some reason, my game times are inverted. It's 11:43 at night right now, and the game seems to think it's 11:43 in the morning. =/ Which really sucks because I have school, work, and sleep in the mornings, so I never get to play at "night" in the game. >.<