Hi! Here's a mini guide to getting the 2 Dottore-related endings in the Wanderer's route.
To unlock the Dottore encounter in Wanderer's story, you need to fulfill a few specific requirements:
1. First, you must unlock and finish Xiao's Main Story ending titled "Monster...?" (the specific route where he ends up killing Aether).
2. Once that is done, start Wanderer's Main Story and make sure you are playing on Hard Mode.
3. Play through the route until Wanderer takes you to the laboratory. During the search mini-game inside the lab, you need to successfully find Dottore's bug.
For the first ending – don't forget to visit the kiosk. For the second one, hurry straight home. Good luck!