I know before sparks/unity was nerfed for the 100k pts cash-out,there were always bots at the Qutrub VW NM, since 500+ damage is 200 swings and with atmacite or having a WHM to throw Cure 4 every however long, you could cap pretty quickly.
Engage
Go make a sandwich
Eat the sandwich
Watch TV etc
Check on if you need to re-pop the NM every however long
Get Sparks
This wasn't just bots. I used to do the same method when I was feeling lazy. Luckily my server rarely had anyone there, and if it did there was always another spot free. From my experience, it's best done on THF/WAR with daggers like Jugo+1 and Atoyac w/ OAT (Blurred+1 may work also).
The idea is to bring your damage low enough that you will slow the fight, but high enough so almost every hit is 500+. Having decent atmacites helps too. My trust combination consisted of Ulmia, Koru-Moru, a WHM and two GEO (Moogle, Sakura). Make a TP set with pure multi-attack; I also liked to have a Defending Ring in there for safety. This way you can keep Defender up if you want to slow the fight down, and as a job master THF it's easy to be hitting 500+.
It will vary from player to player, so it's best to tweak it to your liking. You may find that if you're not geared well enough, there is a chance you could be killed, so add another WHM if you're having difficulty. I don't like using Qultada as a buffer because he damage deals. You can do this on other (dual wield) jobs too, but I preferred doing it on THF because of its extra evasion and Triple Attack.