best bots were botnet and d2jsp. but they are behind on times. i don't even think botnet is out anymore.
i order for a bot not to get realm down or ip ban, they have to be in a game for about 5 minutes each game. so if you can do 4-5 bosses, i would highly sujest that.
if you use yamb with d2jsp, you have a realm down free bot. with d2jsp i did countess, meph, pindle, and like 2 other i forgot since i don't play nemore. but i never got realm down because i did enough bosses and i was useing a 13k hammer pally.