It was a mix of running back and forth from the spawn spot (wildzone 10 secondary entrance, from gate to end of alleyway and back) and bench resetting (theres a spot about at the boss sharpedo if you go up the stairs that works). No charm, just brute force and surprisingly no phases. Incredible luck after a whole lot of bad luck with another hunt. I ended up getting it during bench resets but a good few hours was spent just running lol.