I found that the quickest/easiest way to do this is to farm while doing the Rakyat Trial called Hide and Seek. As soon as you start the trial you want to throw a rock over both of the enemies. They will walk towards it and investigate. When they are done investigating they will start to walk around some more. You can throw another rock to get their attention again. Keep rinsing and repeating.
If you happen to fail the trial, that's fine. Just load it up again.
This is definitely the way you want to do it if you have already completed the game. (Enemies will be few and far between at that point)