US (the better version)
Guide (Will reset for good Popplio): https://docs.google.com/document/d/1mLAdMdN92q0zsLb76vnhMP8hBqOA14xWMsuh8IYOxl0/edit?usp=sharing
Guide (Won't have to reset for Popplio): https://docs.google.com/document/d/11657UGPcM2CxzX3u438-BWhY2bAcIFF8Z6DlP4tHhcI/edit?usp=sharing
UM (the slightly worse version):
Guide (Will reset for Good Popplio): https://docs.google.com/document/d/1P5vUaa5MFR18iz5-vYfaOKAMxblFKEiT0mdrkJf_x58/edit?usp=sharing
Guide (Won't Reset for Popplio): https://docs.google.com/document/d/1KsGO9IZArROxY4CxUNdI1ydpd6I6FmHrZuV2gaHCxgw/edit?usp=sharing
This route is more consistent than Hawlucha (move accuracy and berries) but slower.
Ultra Sun has faster Ultra Recon Squad Fights
Ultra Moon has faster fairy trial Fights
Normal Trial is riskier in Ultra Moon (Outsped and Bite + Flinch is worse)